Quote:
Originally Posted by Gregski
ok fellas help me out here (while we wait for the ignition sector gear to show up) knowing what we know now about the rainbow of colors turn signal switch plug and wiring harness:
How do we activate / test each component?
For example what do we supply to the GREEN wire to make the right rear turn signal turn on?
Do we give it positive power, or do we connect negative to it?
I ask because to activate the horn BLACK wire I have to connect negative to it, but to activate the turn signals GREEN, YELLOW, LIGHT BLUE, DARK BLUE, I have to give positive power to it.
No idea how to activate the other ones, WHITE, PURPLE, BROWN. Please enlighten me in the ways of electric current flow.
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The horn at the column is always a ground on older American vehicles the lead grounds through the horn contact via the steering shaft/column which in turn activates the relay sending power to the horn itself.
As far as the turn signal and hazard wiring goes.... they are all positive.
I am a retired automotive electrician the only test one would do at that connection would be to trouble shoot a single circuit not working as it is suppose to. generally it is fairly obvious if the switch is bad.
For the basics you need to know which way the current flows. all circuits form a loop you need to determine where the part you are testing is in that loop. one way is to figure out where the load (light) is in the loop. Then figure out where the control (switch) is. If the control is in front of the load its positive, if behind it is negative. so lets apply this to your horn circuit. the horn is grounded to the chassis by mounting. the green lead goes back to the relay. A relay is nothing more than a switch. the other side of the relay is fed with battery voltage. to energize the relay we need a control circuit. power enters the relay as normal battery voltage but to energize it we need to complete the circuit. so from the control side power goes in and the ground goes up the column through the T/S switch to the horn contact when you press the horn it ground the black wire which energizes the relay and the horn blows.
I am sure this is all clear as mud. I do better as a teacher in person
