I'd want to hear a more educated person give a definate answer, but I used 
the 'spare circuit' on my 69 when putting in a new wiring harness. One of 
the four had gone bad, and moving all wires to the spare fixed my problem. I 
assume that's what it's for, together with holding a spare fuse too. Both my 
69 and 73 only use 3 of the 4 circuits. Is that true thru 76?
Sloane :)
>
>I have an intermittent ghost electrical problem. Sometimes completely
>dead on the "brown" circuit, sometimes not.
>
>Didn't someone say a new fuse box cured all those type probs?
 
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