Blacky wrote: Mon Jan 10, 2022 5:15 pm
As volts go up current comes down so an overvoltage shouldn't cause fuses to pop .........
I'm guessing that on an alternator with a crook voltage reg, the current could do some weird things, though the voltage goes up. Tha'ts only the current going from the alternator to the battery though. The wiring circuits (and fuses he is cooking) are in parallel to the alternator/battery - they don't see the alternator current, but they do see the alternator voltage. The circuits are fixed resistance, so as the voltage goes up, they draw more current. Or am I overthinking this one?
Cheers,
Harv
327 Chev EK wagon, original EK ute for Number 1 Daughter, an FB sedan meth monster project and a BB/MD grey motored FED.
I’llvtry and get a meter on in a couple of spots and see where the surge is coming from - not really my field of strength so might get the guys at dynomotive to chase for me - Ive often wondered why they didnt run an earth cable full length when they ran the positive and just earth the motor separately
Nothing wrong with using the body as an earth, all cars pretty much do this.
Running an earth cable from the motor to the body in a perfect world should be the same size as the positive. Iv'e done this with all my cars and never had issues with bad earths or melting cables.
If your alternator over charges then normally it boils the battery, blowing fuses has to be something else considering if those circuits are not in use when driving, there can be no path for overload.
Just picks up power of ignition circuit with its own fuse
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I would look at running it through a relay direct from the battery , have the relay coil wired on accessories - those units have a lot of inrush current when they kick in .
I started with nothing and still have most of it left.
Foundation member #61 of FB/EK Holden club of W.A.
