Quote:
Originally Posted by flatbutt
can you do this by removing branch fuses from the fuse box?
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Got smart, sorry.
(please correct if this is wrong!!! It's been a while since school.)
I think wiring typically goes from battery to ignition switch to fuse box to device to chassis/ground and back to battery/neg.
A circular chain.
Fuses are the weak link, designed to burn up before the wires.
Heavier loads will go through relays activated remotely by the ignition switch.
(They don't want too much juice right next to the hands in case it shorts out and there is only so much room through the steering column.)
Ignition modules are on the ground side for protection.
There is a lot of voltage there, seeking a path back to battery ground.
(Shorts will hopefully find another path back first before frying the electronics.)