North American Turbocoupe Organization



Battery Voltage?
w60 Offline
Senior Member
#1
The voltage across my battery with the car off is 13.3 VDC, running it's 13.9 VDC.

Shouldn't the running voltage be 2 or 3 volts higher than the off voltage?
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
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Pete D Offline
Administrator
#2
Here is a good post on that subject and a test is outlined in the last entry:
http://natomessageboard.com/ubbthreads.p...#Post86721
Pete Dunham


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Jeff K Offline
Administrator
#3
13.9 V at idle with headlights and blower on is OK, but if thats the volts with all accessories off and engine recently started, thats low unless ambient temps are close to 100 deg. At a cold start with a few accessories on, 14.2 to 14.4 is typical, with a few tenths of a volt more in real cold outside temps.

What is the voltage after the engine is warm, headlights on, blower on high, and engine at 2000 RPM? Thats the important number.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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w60 Offline
Senior Member
#4
13.9 is warm and nothing on but the radiator cooling fans.
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
Reply

Jeff K Offline
Administrator
#5
If both fans are running 13.9V is ok. They draw big amps. I assume you have the stock 75A Mitzu alternator?
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
Reply

w60 Offline
Senior Member
#6
yep…everything is stock.

Thanks
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
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