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Old 04-01-2019, 01:13 AM   #3
JimNNN
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Join Date: Apr 2014
Posts: 522
Default Re: Overdrive fuse size for '54 Y block 239?

Thanks dmsfrr. I should mention, however, that since I made this post a couple of hours ago, I did find a wiring diagram in the 52-54 shop manual that says the OD relay is equipped in original form with a 30 amp fuse.



I should also say that I had been powering this circuit with a feed from my new fuse box (fused at 15 amps) since I completed rewiring my car a couple of weeks ago. I had this 15 amp fuse blow twice. The OD had never blown a fuse before with the original wiring, but I didn't now if the 30 amp fuse was right size, because I knew it had been replaced once before by a mechanic. It appears that 30 amp may be the correct size, though I may try a 20 amp first, and work up to 30 if I have continuing problems.



So the circuit will be double fused - one fuse at the fuse box and the original 30 a fuse mounted on the (original) relay. Will there be a problem with this? The original wiring was 14 gauge and I believe the new wiring is the same, but I will check.


Quote:
In 6 to 12 volt converted cars that change will technically affect the preferred Current/Amperage values of fuses.
The Current/Amperage value of a fuse or circuit-breaker in a 6 volt circuit can usually be reduced by nearly half if that circuit is changed to 12 volt. (Ohm's Law)
Thanks a lot. I was wondering about that.
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