Quote:
Originally posted by 1997 GA16DE
i think everything on the car is positive triggered except for the dome light and door sensors.
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Oh, you have much to learn my friend.. Almost every ECU output in the world is neg switch, Igntion coil..neg switch. I could go on and on. The reason for this is that there tends to be less of an arc when you swtich the neg side of a load(at least that the reason I was given).
RELAY WIRING
85 and 86 - Give one power and one ground. To make it easy on you I say this.. Give 85 constant +12V and 86 ground, use a switch to make/break the ground side. (horn on/off)
30 - Constant +12V supply.
87 - +12V to your horn
If anybody has ever wondered what the extra terminal(87A) is, in this circuit it would have the +12v with the switch in the off position, when you turn the switch on internal contacts move and push the +12v through 87
I anyone wants a lesson in how realays work, give me a holla.