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post #1 of 4 Old 10-05-2009, 05:00 PM Thread Starter
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Alternator question

I decided since winter is coming to clean the terminals on my batteries and load test them. To my surprise, the 4 1/2 year old Duralast Golds passed the load test with flying colors. While I was at it I thought why not see what my voltage is at while sitting at an idle. The voltage is 11.5-8 with the key on engine off. I start it up and for about 15 seconds it sits at 11.5-8 then jumps to 13.5-8. I've never tested this before and was curious if that was normal or not. The alternator is only, at most, 9 months old.

99.5 F250
Airaid intake
4" Turbo back, straight
6" lift with 37" BFGs
Boost, Trans, EGT Gauges
Tirepaq
AIH delete
DP Tuner 40/80/120/140 with Gauge Switch
6.0 Intercooler
Foil Delete
Whicked Wheel
Billet T/C
Brand new Tranny
Zoodad Mod
6.0 trans cooler with 2 fan controlled coolers.
KCM S.S. HPX Line
Snow Performance stage 3 meth kit
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post #2 of 4 Old 10-06-2009, 09:16 AM
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That's normal, it is your glow plugs drawing. They stay on after the WTS light goes off. I have a voltmeter in the cab and watch for the voltage jump to happen before I drive.

2000 F350 4wd CC SB PSD
Normal mods plus gauges and PHP chip
Lowered to F250 height
Stock tire size, looks stock.

18' 10k# equipment trailer
30' Travel Trailer 7500#
Kioti CK30 tractor
Kawasaki KLX250s Dual Sport
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post #3 of 4 Old 10-06-2009, 11:56 AM Thread Starter
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Damn they put a hell of a draw on the batteries. I never noticed that before, thanks for teaching me!

99.5 F250
Airaid intake
4" Turbo back, straight
6" lift with 37" BFGs
Boost, Trans, EGT Gauges
Tirepaq
AIH delete
DP Tuner 40/80/120/140 with Gauge Switch
6.0 Intercooler
Foil Delete
Whicked Wheel
Billet T/C
Brand new Tranny
Zoodad Mod
6.0 trans cooler with 2 fan controlled coolers.
KCM S.S. HPX Line
Snow Performance stage 3 meth kit
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post #4 of 4 Old 10-07-2009, 03:03 AM
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GP's can draw 200 amps at full power!!! That's why the stock GPR never last very long and should be replaced with the Stancor relay!! It is built to handle a 200amp continous draw for 2 min. I have cut open several stock GPR's and everyone is toasted inside!!

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2000 F350 DRW,CC,LB, 4X4, Western Hauler Pkg.
Ford AIS/ BTM, FTVB
My CCV MOD, Coolant filter
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Cyro/Hawks, JVC Touchscreen HU, JL C5's, Infinity 800watt amp,
DP tunes, 60 tow/80 e/120 race, on a SCT2 tuner
P3 controller, Brite Box Turbo Lifesaver
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