I’m struggling with wiring a reversing DC tailgate window motor in my jeep. It’s a circuit with two relays and two switches. I was able to wire the first switch without issues but wiring a second switch in the circuit is blowing the fuse. Any pointers would be great. diagram here: https://www.fsjnetwork.com/forum/viewtopic.php?t=13549&start=60
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4\$\begingroup\$ Part numbers? Wire/schematic drawings? Can't really help without those. \$\endgroup\$– AaronCommented Jun 19, 2023 at 16:40
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\$\begingroup\$ the diagram is called serehill tailgate relay diagram. i can try to post it here \$\endgroup\$– tylerkdurdanCommented Jun 19, 2023 at 17:09
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\$\begingroup\$ fsjnetwork.com/forum/viewtopic.php?t=13549&start=60 \$\endgroup\$– tylerkdurdanCommented Jun 19, 2023 at 17:10
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\$\begingroup\$ Please edit and add the information to the post, not as comments. \$\endgroup\$– AaronCommented Jun 19, 2023 at 17:16
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2 Answers
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This circuit should give you the behavior you're looking for (updated):
simulate this circuit – Schematic created using CircuitLab
In the default state with no buttons pressed, both sides of the motor are grounded and nothing happens.
If you push the SW1 Up or SW2 Up, then the left relay activates and connects +12V to the left side of the motor, and it runs in one direction.
If you push SW1 Down or SW2 Down, then the right relay activates and connects 12V to the right side of the motor, and it runs in the other direction.
If you press both an Up and a Down button together, then both relays activate and both sides of the motor are connected to +12V - and nothing happens.
So there's no set of button-presses which will result in a blown fuse.
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\$\begingroup\$ i should mention that both switches need to control the motor in both directions. the motor can go up and down so each switch needs to be able to do that \$\endgroup\$ Commented Jun 19, 2023 at 16:56
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1\$\begingroup\$ And the buttons could be SPDT center-off rocker or toggle switches. \$\endgroup\$– GodJihyoCommented Jun 19, 2023 at 18:22
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\$\begingroup\$ the motor is a polarity switching motor so it needs both negative and positive and those polarities need to be reversed to turn the other way. I think i have it wired like you showed but when i use the rear switch i am getting blown fuses so i messed something up \$\endgroup\$ Commented Jun 19, 2023 at 19:02
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\$\begingroup\$ ok I did a bunch more testing and i found that when i splice my coil trigger on relay pin 86 it causes my blown fuses. hooking one switch up works fine but in the diagram the splice from the coil trigger to my two switches does not work. im sure i misinterpreted the diagram or messed up the wiring. any advice? \$\endgroup\$ Commented Jun 19, 2023 at 20:57
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Here's the appropriate schematic.
