This is on a land rover I'm helping sort out for an off-road expedition
I'm trying to wire up the radio with two different power sources, but what I've got at the moment is having some undesired effects.
I'd like the radio to be:
- Always powered when the ignition is on, but without the dashboard LEDs
- Also able to be powered from the battery (A secondary battery, not the main car battery) if switched on.
If the switch is on then the dashboard LEDs should be on too.
If the switch and the ignition are on, I don't really care which source the radio uses.
Currently it's wired like this:
However there are problems:
- The dashboard LEDs are always on when the ignition's on, and
- If the switch is on and the ignition's off, the wipers start going
I thought about fixing it by putting diodes on the ignition-switched source, and between the switch and the radio (after the LEDs), I'm not where to get a diode that I can put 20A through or whether that's a good idea.
Thanks in advance for your help!