amperage question

GhettoPop · 09-02-2005, 08:39 AM

i have a PaPerformance 130amp alt w/ March 1000 underdrives. i charge at about 13.5 volts at idle, thats according to my autometer gauges which draws its reading from my ignition switch. I assume if i connected a voltmeter to the battery it might read even higher. at idle w/ the lights on and a/c, the gauge will read around 12.5 volts. i did upgrade the wire from alt to starter relay to 4 gauge as it was recommended by PaPerformance. I also upgraded my battery cables and starter power wires to 4 gauge.

i would try to upgrade your alt wire to starter relay, i doubt the factory wire is large enough to make use of all the power the alt is producing. if you want more juice, change the size of the alt pulley and i would leave the underdrive crank pulley alone.

Hozer 88GTConv · 09-02-2005, 01:50 PM

Thanks for the advice.
It looks like 8 gauge wire is coming from the alternator.
I'm going to upgrade everything to 4 gauge.
Right now, it's only putting out 12.7 at 1500 rpm on the fluke meter.
If that doesn't do it, I'll go to a smaller pulley too.
thanks again, I'll post results later.

09-02-2005, 08:39 AM	#1
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Re: amperage question i have a PaPerformance 130amp alt w/ March 1000 underdrives. i charge at about 13.5 volts at idle, thats according to my autometer gauges which draws its reading from my ignition switch. I assume if i connected a voltmeter to the battery it might read even higher. at idle w/ the lights on and a/c, the gauge will read around 12.5 volts. i did upgrade the wire from alt to starter relay to 4 gauge as it was recommended by PaPerformance. I also upgraded my battery cables and starter power wires to 4 gauge. i would try to upgrade your alt wire to starter relay, i doubt the factory wire is large enough to make use of all the power the alt is producing. if you want more juice, change the size of the alt pulley and i would leave the underdrive crank pulley alone. __________________ 1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong!

09-02-2005, 01:50 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: amperage question Thanks for the advice. It looks like 8 gauge wire is coming from the alternator. I'm going to upgrade everything to 4 gauge. Right now, it's only putting out 12.7 at 1500 rpm on the fluke meter. If that doesn't do it, I'll go to a smaller pulley too. thanks again, I'll post results later. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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