An application field of electronics that requires high reliability and fail-safe systems. Application can vary widely in temperature ranges and a wide voltage range, typically 12v (or 24v) while off and higher when on.

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37 views

Diagnosing Vehicle Brake Lamp Fuse Blowing; What to test next? [migrated]

Fuse keeps blowing when I press the brake pedal on a 98 Windstar. Brake switch is good. Inserted new fuse and the brake lamps do not light up before the fuse blows. Removed all bulbs front and back ...
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41 views

Automotive electrical question [migrated]

I would like to hook up a under hood lamp to my Cadillac Escalade. A TSB (Technical Service Bulliten) from Cadillac says to never connect accessories to the vehicles wiring without using a diode to ...
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2answers
65 views

What kind of micro bulb is this? [closed]

I am doing a clone of my Honda's dashboard circuit. Everything is fine except I cannot find the tiny backlight bulbs (see photo) that are used for the dashboard button illumination. Are they standard ...
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1answer
70 views

Running the AC overnight in an EV car [closed]

I've heard we will have EV cars (not hybrids with small combustion engines) that can drive 200 miles between charges soon. I was wondering about the battery cost (in terms of dissipation) if you were ...
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3answers
70 views

Short circuit in Vehicles

I wanted to know what are the techniques employed in heavy vehicles to avoid short circuit or protect if short circuit happens? Since the batteries in heavy vehicles are highly powerful and short ...
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0answers
63 views

Replacing parallel 12V incandescent bulbs with LED “bulbs”, voltage problems

My van has six "25W" bulbs in parallel on a 12V-nominal circuit. If I unplug all the bulbs, leaving six empty sockets, then I see pretty much the same 12.5V at the sockets as I see at my battery, and ...
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0answers
54 views

Trouble with lights on truck, using dc-dc converter & flasher unit [migrated]

Hello EE Stack peoples, I have a friend who has asked me to help him sort out his truck lighting. It is a 24v truck with a 24-12v dc-dc converter for the body. It has 2 flashing lights, that when ...
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1answer
122 views

Reading car speed sensor (SDV)

I've been trying to interface with my car's info screen, called a TID (Triple Information Display), from Opel. From the factory, there are multiple things attached to this screen, one of those a line ...
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1answer
59 views

Appropriate BJT for car circuitry

I am designing a LED Headlight for my car. But I am confused about my BJT, I dont know if it is suitable or not. The overall design is given below. The problem is, when I run the ckt under engine ...
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0answers
68 views

What tool can monitor voltage on a bundle of wires?

I'm working on a vehicle and trying to determine which wires control which circuits - power windows, power locks, starter, trunk release, etc. I've searched but have not been able to find the wiring ...
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1answer
79 views

How to calculate solar panel setup?

I have an equipment which draws 550W at a constant level, no peaks. I want to power this unit with solar cells only during the day when there is light using a simple car battery. Because I don't want ...
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0answers
68 views

Can AC/DC conversion losses from solar panels be avoided with a Tesla Powerwall?

(background: I'm just playing with numbers, trying to estimate how many solar panels would be needed to fully supply the energy for a home and 2 Tesla cars) I've been reading up on solar panels and ...
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1answer
40 views

Converting 12VDC to 7..9VDC (20A)

I used to have a 3-coil cooling fan that would rotate slow or fast depending on what is powering it - the air conditioner "signal" would make it rotate slower than that of the engine heat sensor. Now ...
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0answers
39 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
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3answers
97 views

Insufficient current to drive automotive relay?

I'm adding a leisure battery to my van so I can run some stuff with out fear of draining the starter battery. My leisure battery is wired to my starter battery so it can charge from the alternator ...
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1answer
77 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
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1answer
26 views

Autoelectrics: Testing components off 12v battery

I'm quite good with mechanics and am just starting to learn more about electrics specifically applicable to automotive. One thing I am still yet to get the grasp of is the way electricity behaves. It ...
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4answers
1k views

Checking when a car horn is pressed?

I want to detect when a car horn is pressed. The only way I can detect it currently is using the voltage on its line. When the car is turned on, there is always 12V being supplied to the horn through ...
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2answers
86 views

Basic 12V Step-Start Circuit For Automotive Fans: Troubleshooting

To keep this short and sweet, I wanted to make a circuit/controller to decrease the inrush current on a large powerful fan for my race car. I ideally just wanted something that wouldn't let the amps ...
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2answers
85 views

Driving a large, noisy, free-wheeling DC motor (cooling fan)

I have an automotive cooling fan which is nominally 12v and draws about 15-25A with a BIG inductive spike at startup (will happily blow a 30A fuse). These are traditionally wired via standard ...
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3answers
102 views

Proton current? and its potential effects in cars and circuitry

Is this statement true: "Within the (lead-acid) battery, the electric current is primarily due to proton (hydrogen ion) current which is in the same direction as the electric current." What are the ...
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2answers
26 views

Stopping Vehicle Mounted Units from stopping abruptly

I have installed a touchscreen computer in my old car. The computer runs on 12V DC power supply. I have installed a standard 24V DC to 12V DC converter to power the computer. The 24V DC input to the ...
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1answer
55 views

Car speed sensor to turn on something [closed]

Is there a sensor for the speed of the car that can be programmed to turn on something when a car reaches to a specified speed? If yes, what is it’s name, and whare to find it online?
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34 views

Need Help On Proper Circuit

So I am building a NFC unlock for my car using an arduino and an NFC reader. So this means the arduino should be on all the time, unless you can think of a better idea. Right now I plan on having a 6v ...
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2answers
138 views

How to mix to video sources into a split screen (two inputs, one output)

I want to build a circuit for my car (It has two cameras, front and rear) that shows me the front and rear camera in the same screen (splitted), top half the video from the front camera and bottom ...
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2answers
86 views

PCB design for automotive fusebox?

I am currently in the process of designing an automotive (motorsport related) fuse-box as a side project to my studies. I've not had much luck searching for fuse holders (20 position) however while ...
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1answer
125 views

How can I power a cellular phone for a week with a car battery or other type of battery?

I am about to start construction of a new house, and unfortunately the property is not near where I live. I wanted to keep an eye on the construction site (No electricity) to make sure workers are ...
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4answers
199 views

Heating a 1km long wire to 110 C using a 12v supply from a car cigarette lighter

I am a complete newbie to anything electrical/electronics. I am doing a project where I need to heat a 1 km long (Nichrome/Kanthal) wire to up to 110 degree Celcius. The only power supply available is ...
2
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1answer
99 views

Car Ground Point Requirements

I work on a car structure precisely on a body in white which include parts in aluminium and some others in carbon fiber... I wonder if there are any requirements for the location, number of ground ...
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1answer
54 views

CDI ignition timing design

In CDI, the magneto-flywheel assembly along with pickup coil generates ignition timing signals which is one negative and one positive pulse separated by some angular distance used to decide the ...
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votes
3answers
108 views

Op Amps and High Pass Filters; Low Audio Volume [closed]

I'm working on an audio crossover for a friend's stereo system. I have a passive design that uses a single 330uF in series with the positive audio line. It works like a charm , but I'd like to see if ...
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1answer
33 views

Audio High Pass Crossover Question

I'm doing a sound system for\with a friend of mine (I've done many, many before).... In the past I've done either simple L\C or LC crossovers, but I've been looking around for something I can build ...
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2answers
116 views

12 Volts or Nothing

Hello so I am hooking up a LED strip to my car but I am having trouble with the dimmer on the dashboard. To make this very simple and easy what I am trying to achieve is to cut off the power from the ...
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1answer
265 views

How to test for live wire in a car using an analog multimeter?

Let's say I cut my headlight harness off. Inside the wire loom, there are three orange wires, like this: I know one of them is for low beam, one for high beam and one for ground. I have an analog ...
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0answers
36 views

Waterfall diagram for car starting coil signal/interference

Does anyone have a waterfall diagram for the signal given off by an ignition coil when a car starts (or is operating)?
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0answers
23 views

Creating a pulse when the circuit opened and closed [duplicate]

I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit. So: When I the car's ignition line is on it has ...
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1answer
101 views

Measuring the resistance of a button

I need to know the resistance value of buttons on a car steering wheel. Therefore, my question is: How do I measure the resistance of a steering wheel button using a digital multimeter? I don't ...
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1answer
94 views

Electronic Ignition

I have a friend online and he gave me a schematic to make an Electronic ignition module for motorcycle, I just want to know that if this is the working circuit? also I m not getting some parts here in ...
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1answer
381 views

How do I wire a phone/AUX input into a car stereo?

My car came with a Blaupunkt 520 as the factory fit head unit. As it uses the on-steering-wheel controls, I don't really want to swap it out, but I do want to add the ability to plug a device into it ...
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3answers
392 views

CAN Bus Physical Layer Twisted pair or not

CAN bus is very common in automotive or vehicular applications. In our case, we are using aerial platforms with have CAN bus links between operator remote and ground control box. As is very typical ...
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1answer
176 views

switch 12V with 12V ACC (car)

I'm currently trying to design a circuit for my car which will switch itself OFF or ON depending on +12V signal from ACC(accessory) cable. Car is providing me a +12V battery power, +12V accessory ...
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2answers
158 views

Fuel Injection Control through OBD port?

I am trying to implement remote control of a car, by connecting a GSM device to OBD port. If someone is using my car, I need to remotely stop the vehicle by sending command. Upon sending STOP ...
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1answer
227 views

Beaglebone black gets shutdown signal when I move rc motors

I have a beaglebone black that I tucked inside an rc truck. I removed the radio control chip. Everywhere it had 3.9 volt logic I put in a 3.3v gpio control from the beaglebone. It works great I'm ...
2
votes
1answer
145 views

Is a 9.6µs over-voltage transient long enough to fry my circuit (Details inside)?

I am designing a board for a 12V automotive environment, with a variety of input voltage transients including load dump and permanent 24V over-voltage. I am using a TVS at the input to clamp to around ...
2
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0answers
41 views

Certification for automotive accessories?

I have read a number of posts here relating to certification of devices for sale in the US, but the majority of them pertain to emitters such as BLE and Wi-Fi. To keep it simple, I have 2 ...
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2answers
320 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
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0answers
94 views

AUTOSAR OS configuration example

As with version 3.0, AUTOSAR switched from OSEK-OIL to a XML based format in order to configure their OS. I'm looking now for an example of how this configuration can look like. The AUTOSAR ...
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1answer
65 views

If I have a device that transmits data over Bluetooth, is it possible to get at that data via a different device with my own custom code?

I am looking at building a tyre pressure info system for my car, but would like to make use of the existing receiver and transmitters that screw onto your tyre's valve stems. A model exists that ...
2
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1answer
176 views

Kvaser Leaf Light CAN BUS Simulator problems

I'm learning to use this tool Kvaser Leaf Light V2 with CAN-BUS. I'm stuck with some problems. I can read the packets around the CAN-BUS line from the car, I can save it in a text file, but when I ...
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3answers
316 views

What's the reason for wiring a relay this way?

I came across the following automotive wiring diagram: One thing I don't quite understand is the way they wired the relay. I've got two main questions. It appears to me that they used the exact ...