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I'm using a 2 speed windshield wiper switch to control the headlights in my car. I assume, based on the diagram below, that I need to install some sort of diode to always feed 12v+ to the parking lights when the headlights are on, but not to feed 12v+ to the head lights when only the parking lights are on. My electrical engineering skills are quite limited.

1.) Am I approaching this correctly?

2.) If so, what type of diode should I install? Keep in mind this switch/circuits are only activating relays, and not actually powering the lights, so the amperage load should be quite small.

 

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Your thinking is correct and get a few extra's of the 1N4003 (200v) diodes,
you may find some other uses in the future.

I had to install some on a sn95 ecm when we were manually running the
electric fan and the ecm was thinking the fan should be off it would then
drastically lower the idle rpm.....installed a diode in both the low speed
and the hi speed fan outputs on the the ecm to block the signal and all
was fine.

I never did figure out why it was doing that, weird ford stuff.
 
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