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Noel · 08-15-2008, 02:43 PM

'97 Geo with 1.0L

For those wondering just how much electric they use,

I hooked up an analog amp gauge with shunt. Easily to read to about .5 accuracy, good enough for this...

I hooked the gauge on the alternator feed wire going to the main fuse box where the 70 amp main fuse is.

With a fully charged battery, increasing rpm with load to ensure that alternator was able to put out what was being used:

DRL Disabled

Engine running, no lights or accessories on: 14.5 amps

Parking Lights: +4.5amps
Full Lights + 13amps (high beam no real difference)
Fan 1 +5.5
Fan 2 +7.5
Fan 3 +13.5
AC enable +5 for Condenser Fan

Turning on EVERYTHING I could, including rear defroster & Wipers, consumption was 64 amps. Not bad for a 55amp rated alternator. Battery connects on the fused side.

08-15-2008, 02:43 PM	#1 (permalink)
Noel EcoModding Lurker Join Date: Jul 2008 Location: St. Louis Posts: 63 Thanks: 0 Thanked 1 Time in 1 Post	Geo Metro Electrical Audit '97 Geo with 1.0L For those wondering just how much electric they use, I hooked up an analog amp gauge with shunt. Easily to read to about .5 accuracy, good enough for this... I hooked the gauge on the alternator feed wire going to the main fuse box where the 70 amp main fuse is. With a fully charged battery, increasing rpm with load to ensure that alternator was able to put out what was being used: DRL Disabled Engine running, no lights or accessories on: 14.5 amps Parking Lights: +4.5amps Full Lights + 13amps (high beam no real difference) Fan 1 +5.5 Fan 2 +7.5 Fan 3 +13.5 AC enable +5 for Condenser Fan Turning on EVERYTHING I could, including rear defroster & Wipers, consumption was 64 amps. Not bad for a 55amp rated alternator. Battery connects on the fused side.