GNX Gauge Cluster Lights Not Working

[gn87man]

I have used the search function but could find nothing regarding my issue.

I have a GNX gauge cluster installed on my 87 GN.

The gauge lights just stopped working the other night, while I was driving.

All gauges still work fine.

I have checked all fuses and gauge bulbs and all are good.

Any ideas on which colored wire supplies voltage to the bulbs?

I have attached a few pictures of the front and back of the gauge cluster and the main block connection that connects the main power harness to the gauge cluster.

Any help would be greatly appreciated.

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[gn87man]

Bump

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[Chuck Leeper]

Appears the lites are daisy chained, using gray, and blk.
Trace the source of both wires. Check for 12V at the gray, and ground at the blk.

 

[gn87man]

Appears the lites are daisy chained, using gray, and blk.
Trace the source of both wires. Check for 12V at the gray, and ground at the blk.

Thank you Chuck. I will try that approach and let you know. Take care.

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[gn87man]

Update...

Found the issue and fixed it.

I tested the gray wire in the main harness connector that feeds the gauge cluster (car side) and received 11 volts. Good there.

Then I disconnected the main harness connector (car side) from the gauge cluster connector (gauge cluster side) and tested the gray wire female copper pin/connector (car side) and received 0 volts. So I sanded the female copper pin/connector (car side) to clean off the corrosion. The gauge cluster connector male pin was good (no need for cleaning).

Then I reconnected the main harness connector (car side) to the gauge cluster harness connector and the gauge cluster lights worked.

Hopefully this will help anyone with this gauge cluster light problem in the future.

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