Gauge Cluster Flashing On and Off

[Seadweller]

Is there anything in the circuit that might cause a voltage drop at that fuse?  A relay?  Some sort of regulator?  If it was a bad ground, I would think it would impact at least all of row B on the fuse box.

[Loren]

I really think you need to put a scan tool like Durametric on it. They are easy to use - in this case you just tell it to  scan all control modules.

The see what faults come back.

[Seadweller]

57 minutes ago, Loren said:

I really think you need to put a scan tool like Durametric on it. They are easy to use - in this case you just tell it to  scan all control modules.

The see what faults come back.

 

I'm heading in that direction.  I completely disconnected the gauge cluster, and at the B1 fuse I'm getting the following:

 

1.  11.5V with key out

2.  11.5V at the accessory position on the key switch

3.  7.5V with the ignition on

 

I'm beginning to rule out the cluster itself, given that it's now completely out of the system.  One of the strangest things I've ever come across.

[Seadweller]

I wanted to update this in case anyone is interested.  After correcting some testing mistakes I was making, I found 12.4 volts at the B1 fuse, and 12.4 volts at all pins powered with 12V+ at the gauge cluster.  I also tested continuity of the grounds from the connector, and all tested good.

 

I have the cluster at a local shop, as voltages from the battery to the cluster are steady, with the ignition switch in all positions.