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Old 07-12-2006, 10:02 AM
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relay wiring issue

I am wiring a spdt relay to run a nice clean 12v, through a fuse of course, to my hei and using the original keyed 12v wire from the harness to trigger it. From the positive side of the battery there is a inline fuse and then to terminal 30. terminal 87 goes off to the hei. terminal 86 is connected to the cars switched 12v wire that was going to the hei. And 85 goes to the battery neg terminal. Now everything works fine except when I try turning the car off. For some reason the relay will not disengage or something? there is still power going to the hei after the key is turned off?

Some might ask why I am even bothering to do this, well from what I have heard the 69 gto harness possible has a weak 12v source to the ignition, so I would like to elimiante this as a possible problem.

Any help would be great!

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Old 07-12-2006, 11:01 AM
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The relay may be fried. Check for continuity between 30 and 87 when the relay is de-energized. If you have continuity the relay contacts are fused.


Vince
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Old 07-12-2006, 11:22 AM
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Turn the key on and off several times without starting the engine and listen or feel for the click of the relay when it picks up and drops out. When you try to shut the engine off do you still have 12v on 86?
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Old 07-12-2006, 05:41 PM
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Doc here,

Double check your wiring again..be sure 87 and 87a aren't shorting..

Next meter your coil (relay) Switched 12 volts..be sure it shuts on and off with the key..(and the alternator isn't holding it high..when it's running) If that's the case, you may have to install a Diode on the switched wire for relay coil power..

Other than that, welded contacts are about the only other thing I can think of that will hold the contacts in.

Doc
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Old 07-12-2006, 08:29 PM
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I have swaped a relay I have running on my truck to contorl my trucks fan which is wired the same way and it does the same thing. The relay from the gto works fine in my truck, but neither relay works in the gto. So I guess I might need a diode.
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Old 07-12-2006, 08:30 PM
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where can I get a diode, radio shack?
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Old 07-12-2006, 08:42 PM
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Doc here,

BE SURE, the 12 volts is going off when you switch the Ignition switch off..with a meter..you must-->* start the engine,*<-- then put your meter on the Coil power and ground, set for DCV, V X 50 , or auto range..

If when you turn the switch off powering down the engine, 12 volt power does not go away, verify the RELAY COIL wire goes to the "Hot in Run" position..on the switch..and no Alternator output lines are on that wire..

If so, you must move your alternator output to the starter solenoid battery terminal..Or install a diode on the relay coil for the HEI..a 1N4001 at rat shack will work fine..

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Old 07-12-2006, 09:22 PM
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thanks, I'll check this out this weekend!
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Old 08-01-2006, 10:30 PM
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Diode

Yes: Radio Shack has the diodes. They keep electrical feedback from happening. I have to put 2 in my rear 4 way flashers because I'm just using a toggle switch to run them.
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