Re: No Power to the Gauge Fuse
Since you didn't say what kind of car you're working on, I'll assume it's a gen 1 Camaro...
The fuse box is fed by a single 12ga (red) wire from the front light harness via the bulkhead connector. The only exception is the INST LPS fuse which is fed from the headlight switch.
It seems very odd that you can have power to some fuses but not all.
For a 69, the ACC spade on the fuse block is protected by the RADIO fuse
The IGN spade is protected by the DIR SIG BACKUP fuse.
To test these fuses, ground your test light (I usually use the park brake bracket), turn the key to ON and test both sides of the fuses. Power to both sides means the fuse is good. Power to one side only means the fuse is bad. Power to neither side means ???.
Also, the fuse clips in the box tend to rust on these old heaps - if yours are they need to be cleaned to shiny metal.
Edit - The horn button on your steering wheel completes the ground side of the circuit, so it's normal to find no power there. The horn gets its power from the horn relay bus - if you have no power there you have big issues
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Last edited by BPOS; Aug 2nd, 15 at 10:55 AM.