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desmomini  



Joined: 06 Aug 2017
Posts: 4
Location: South Carolina

PostPosted: Sun Oct 15, 2017 11:25 am    Post subject: Oops Reply with quote

Somehow I blew out all my dash lights.

Odometer, speedometer, clock, this pressure, that pressure, what have you.

All fuses appear okay.

This is a 1978. From what I see, there is no single fuse or relay that controls all the interior dash lighting??

Please give me a simple solution, and I promise not to be stupid again.
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brian19600  



Joined: 28 Oct 2013
Posts: 375
Location: NJ/CT

PostPosted: Mon Oct 16, 2017 10:44 am    Post subject: Reply with quote

Rheostat dirty?
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78 924
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Kenodog  



Joined: 25 Jun 2003
Posts: 2303
Location: Vancouver,B.C.

PostPosted: Mon Oct 16, 2017 1:08 pm    Post subject: Reply with quote

It is very common for the light switches to fry out. I have seen many that were so cooked I was amazed the car hadn't caught on fire.





Leigh
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1979 Euro 931, Olive
1981 931, Sabine
2014 Mazda CX-5 (Kid's limo)
2008 GS500
1996 Dodge Caravan (DJV)
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desmomini  



Joined: 06 Aug 2017
Posts: 4
Location: South Carolina

PostPosted: Sun Oct 22, 2017 2:50 pm    Post subject: Reply with quote

Figured it out!

Tucked in the wiring behind the lightswitch, there is an (undocumented) in-line fuse that bridges the blue/white wire that feeds the potentiometer
wheel. Sure enough, once I figured how to open the case (hint: pry first, then turn) I found a burnt out 8 amp bullet fuse inside. Replaced it, and my dash lights are back. Well, except for the speedometer light, which I'll replace when I get the whole unit out to fix the odometer.

While the light switch was out, I sprayed the whole thing with electronic contact cleaner. Those 1.2 amps bulbs are really shining now!

The irritating thing is that this in-line fuse is not mentioned in the owner's manual, the Haynes manual, or anywhere I could find on the web...until now!
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