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Old 08-03-2014, 09:59 AM   #1
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Instrumentation lights

I am attempting to change out the instrumentation lights to LED on my 73 Mustang. I have the directional working as well as one of the speedometer bulbs working. I have checked and the bulbs not working are not getting any voltage. I have cleaned to contacts with electrical cleaner and nothing. Is it common for the circuit board to only work for certain bulbs? Is there away to test it before I buy a new one. Thanks.



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Old 08-03-2014, 10:53 AM   #2
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All of the bulbs ground through the metal clips that hold them in, clean them up and put a dab of dielectric grease on them, if that doesn't work idk what would be next


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Old 08-03-2014, 03:18 PM   #3
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Get a test light and just start probing and see where the power is lost
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Old 08-06-2014, 12:48 PM   #4
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You can check continuity on the circuit board too. I had them in my '66, and they worked fine. I know it's a different setup, but it sounds like you might be on the right track with the circuitry

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Old 08-09-2014, 10:51 AM   #5
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Well, I changed out the circuit board and the lights came on. Then the next time I tried to turn them on, nothing. The only light working are the 3 that worked before, the directionals and the red mustang on the bottom of the speedometer .now I am thinking it is the headlight switch. Any ideas?



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Old 08-09-2014, 11:40 AM   #6
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If it worked, then didn't, I would for sure look around for a loose connection or short before throwing more parts at it.

I had no left turn signal or brake light and replaced the turn signal switch but it didn't help. Turns out that there was just one wire that had pulled loose from its harness up under the dash.
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