Mach 1 Club

For the last week I've been trying to puzzle out why nothing in the instrument cluster light wise seemed to work.

Illumination, high beam, turn sig's, and brake light: all dead.

I'd checked the connections to the wiring harness and everything appeared fine. Cleaned all the connections at the wiring harness plug but no change.

Being that since nothing worked I assumed that power must somehow be cut from the circuit and have been scouring the wiring harness looking for cut wires, blown fusable links and such with no luck.

I just pulled the cluster out of the car again this morning to give it the thrice over and finally discovered the problem: every single one of the 11 light bulbs had corroded down at the connection point in the socket they plug into and had lost their contact with the harness.

It blows my mind that all of them could be bad but there it was.

This problem cost me so much time that I figured it was worth writing this up.

BTW does anybody know what the wiget is on the back of the speedo? Sort of looks like a cross between a circuit breaker and a buzzer.

SOUNDS LIKE YOUR WIDGET MIGHT BE THE VOLTAGE REGULATOR FOR THE INSTRUMENT CLUSTER

While frustrating to find the problem, at least it sounds like an easy fix! Good heads up for everyone!

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(06-23-2012, 04:41 AM)Holychrome Wrote: [ -> ]BTW does anybody know what the wiget is on the back of the speedo? Sort of looks like a cross between a circuit breaker and a buzzer.

Here is a pic of the constant voltage regulator:

http://www.cjponyparts.com/mustang-const.../p/HW1567/

Yep, that's the wiget.

Now that all my instrument bulbs are making contact and I plug the harness in......

..... they're still not coming on.

So it's around the block again to look at that funky connection to the harness.

I just reshaped the curves of the contacts in the harness connector to make them stand up higher and that did the trick.

All lights in the dash operational.

Your opinions were useful to me, thank you!
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