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generators used them
Hi,
The old cars with generators used ammeters, new cars with alternators should only use voltmeters. DC current is dangerous and if shorted or not wired correctly will BURN down your car. Most cars use 80 amps to run things;
electric fan 25 to 35 amps, lights, 8 amps, ignition 5 to 30 amps for MSD, heater 20 amps, etc 'that is why you have a 100 or 140 amp alternator.
The point is don't put all that through a 30 amp gauge, you can over heat and BURN your car down.
I have worked with DC in the phone industry for 35 years and have seen shorts arcing and welding big ironwork without blowing a 60 amp fuse.
Perry 
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Last edited by HighPlainsDrifter; 03-30-2020 at 09:44 AM..
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