Dash Printed Circuit Replacement Issue

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BSC73

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1973 Fastback Mustang Mach 1 351Q 4v
Hello everyone, a little background information I currently own a 1973 Mustang Mach 1 351 Cleveland 4v Q code.

I recently replaced the printed circuit dash gauge on my mustang with a new replacement off of NPD which I will link to at the end. I also took the opportunity to replace my gauge lights since I pulled the dash out and used a led kit from NPD, which I will also link. When I went to check the lights by reconnecting the dash, none worked except for the turn signal lights. Does anyone know what might be the issue? Any suggestions are appreciated greatly, thanks.


Links:
 
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1972 Mach 1 Q code
2007 GT
1969 Cougar Eliminator B302
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Led bulbs are polarity sensitive, try reversing the way you put them in. The main connector may be corroded or inserted improperly. Chuck
 

DaveMT

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1973 Mach-1 Sportsroof (1970, 351C-4V M-Code Motor, 4-Speed Toploader)
You can hook up each one of the LED Bulbs to a 9-Volt battery to test them. The attached diagram shows which side of the bulb needs to be connected to positive 12-Volts.
 

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  • 1973 Mustang Gauge Cluster Circuit Board Diagram.jpg
    1973 Mustang Gauge Cluster Circuit Board Diagram.jpg
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DSwan

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You can hook up each one of the LED Bulbs to a 9-Volt battery to test them. The attached diagram shows which side of the bulb needs to be connected to positive 12-Volts.
I tested my cluster lights on the bench using a 9-volt after installing led bulbs as you outline. It worked great and kept me from having to r&r the cluster several times.
 
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My all time favorite vehicle is our 1969 Shelby GT500
I tested my cluster lights on the bench using a 9-volt after installing led bulbs as you outline. It worked great and kept me from having to r&r the cluster several times.
Thank you for sharing the results of the suggestion from DaveMT. It looked like a solid suggestion. Good to know you concur.
 
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