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Discussion Starter #1
I need help, I have a 1991 Mustang GT. I'm trying to get it smogged & it fails due to no Check Engine light. I think it's a bad ground somewhere. The car runs great, smooth idle no problems there. It has new battery cables, and new ground strap that goes from the engine to firewall. Only the Battery Light comes on in the instrument cluster nothing else.

Any suggestions? Thanks
 

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For anybody who comes across this thread. I found the problem, it was on the back side of the fuse box. Fuse #18 is the fuse that goes to the instrument cluster. One of the slots had backed out, and the fuse was not fully connected. I just pushed it back in, & everything worked great.

Maybe this can help if you have the same problem.

Good Luck
 
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