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Post: Dim Headlights

doubleE
Valued Contributor
Posts: 3688
doubleE

Loc: Eagan MN
Reg: 06-02-03

07-10-12 03:25 PM - Post#2246702
In response to junky

junky Said:

doubleE Said:

................
PS – The horn relay works on the same general principal. The horns draw a lot of current, more than you want going thru the steering wheel horn button. So they used a relay – low current thru the horn button to operate the relay and high current thru the relay cont

The horn wire at the steering wheel is a grounding wire, and when you depress the horn ring, it completes the path to ground. The horn relay is an isolated relay, and it uses the ground to complete the circuit to draw in the relay contacts to send the power to the horns. The horn relay is always hot, and that is why the horn will work even though the car isn't running.

Junky, I'm not sure if you agree or disagree with my horn statement. The relay is doing the same function reguardless if the horn button is completing the - or + side of the relay coil operating circuit. And there would be the same amount of current thru the horn button. In either case (horn or headlights)the relay is acting as an isolating relay. I did use the term "general principal" for that very reason. I guess to prove the point, although it would be dumb, you could rewire the light switch and relays to switch the ground side of the relay coil the same as the horn circuit does.

Eric

Proud owner of My Blue 62 Impala SS

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