4WD Light switch ? - JeepForum.com
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post #1 of 5 Old 07-07-2020, 06:46 PM Thread Starter
JohnW63
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1992 YJ Wrangler 
 
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4WD Light switch ?

After putting the wiring back together on our 92 Wrangler, I have found the dash light the should only come on when I have it shifted into 4WD is one most the time but flickers off and on. I checked the electrical manual and it says there is a switch " To the left of the battery on the dash panel ". That's a bit odd. The battery is no where near the dash, really.



Anyone know where this switch is, so I can check it ? I would like to figure out the connection from the transfer case to this switch to turn on the light on the dash. I know I'm not in 4WD. I did have to change the vacuum lines back to the gearbox as well as fix wires. Maybe something is not quite sealing up on those lines.

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post #2 of 5 Old 07-07-2020, 08:51 PM
timatoe
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There's an explanation of the vacuum system in the FAQ's. I don't know when the switch got moved to the CAD housing on the front axle but I think it was after '91. The older models like my '90 there was a little blue canister on the firewall next to the battery. That canister was fed by vacuum from the transfer case; when you switched to 4WD vacuum is applied to the canister it created a ground path for the circuit and the light came on. If yours is in the CAD housing it's doing similar.

You can search for a thread from Anticaman on the TJ/XJ transfer case switch that gets rid of the vacuum but that also entails disabling the CAD by either locking the shafts together or replacing them with a one piece shaft from a TJ or XJ.
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post #3 of 5 Old 07-08-2020, 06:36 AM
Chrisnvegas
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He's right. The switch is on the CAD. It's the only wire going to it. The wire is ground based. Meaning, the switch is a ground that complete the circuit.
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post #4 of 5 Old 07-08-2020, 08:35 PM Thread Starter
JohnW63
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Got it figured out.

I recall not being able to push the connector back together enough to hide the red rubber seal. So, I got some silicone lube, since it won't mess up the rubber like regular grease will, and it slid all the way on. No more flickering.



Which also showed the light was working opposite of how it should. I went back under and flipped to two hose fitting on the vacuum actuator and that fixed it. The shape and curve of vacuum lines I had to find on eBay made it fit a lot smoother the other way.
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post #5 of 5 Old 07-09-2020, 04:24 AM
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You did well!

[size=“3”]Shackles & D-rings are different things.
Cranking IS turning over
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