Back up (reverse) and 4WD light switches - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-18-2007, 08:50 PM Thread Starter
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Back up (reverse) and 4WD light switches

Wiring and lighting gurus, I need your wisdom,

I followed the factory test procedure to asure there is continuity between both pins on the t-176 tranny when in reverse. Both procedures provided indication the switch was good. We had positive and negative ran to the switch via the wiring harness. When the connector is connected on the switch and the shifter is in reverse, voltage readings are a negative and a negative instead of being positive and positive to get the brake lights to light up.

Also, the 4WD light does not work on the dash. We have 12V on the wire/connector that pushes down on the pin on the transfer case. Is this a compound problem related to the reverse/backup connection?

Thanks

1985 CJ with a transplanted 94YJ 4.0L motor, T176 tranny, mainly stock otherwise. ><>
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post #2 of (permalink) Old 06-20-2007, 12:54 AM
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Ground the wire to the 4WD indicator, if it donít light, youíve got other problems.

Jumper across the backup light connector, if they donít come on, youíve got other problems.

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Originally Posted by DuaneD View Post
When the connector is connected on the switch and the shifter is in reverse, voltage readings are a negative and a negative instead of being positive and positive to get the brake lights to light up.
That sounds like a bad connection on the 12V feed. This is one of those times you need to troubleshoot with a test light rather than a high impedance voltmeter.

Looks like the only other things on the same feed with the backup lights are the cigarette lighter, the brake warning light and the electric choke. The feed for the 4WD light has the same 12V feed as your gauges.

There are 10 kinds of people in the world.
Those who understand binary and those who don't.
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post #3 of (permalink) Old 06-20-2007, 09:35 PM Thread Starter
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Taz,
We got the other problems.

1.When in reverse and ignition on, the switch appears to ground the positive signal to the red wire.

2. Grounding out the 4WD wire does not make the light go on.

What should be check now? Thanks,
Duane

1985 CJ with a transplanted 94YJ 4.0L motor, T176 tranny, mainly stock otherwise. ><>
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