Is a current draw common??
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Senior User
Joined: May 2005
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From: Fruitland MO
Is a current draw common??
Have an 86 F350 4x4 with a transplanted 7.3 out of a 92. Just curious what could be drawing on the truck as it sparks pretty good when I hook the battery cables up. It has no stereo and is completely stock other than the motor swap. Thanks
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Senior User
Joined: May 2005
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From: Fruitland MO
I unplugged the engine harness and tried it again and it still does it....so its nothing to do with the engine swap wiring. Wonder what in the heck could be drawing enough to spark
Elder User
Joined: Oct 2006
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Check for any lights being on that shouldn't be -- dome, glove box, brake, parking, etc.
Hmm ... maybe a leaky diode in the alternator? Try temporarily unhooking the alternator and see if it helps.
Does the truck have a brake controller?
Hmm ... maybe a leaky diode in the alternator? Try temporarily unhooking the alternator and see if it helps.
Does the truck have a brake controller?
Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
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From: Ladner, British Columbia
Time to replace the Altinator
Sometime installing a new altinator can finish off an old regulator. Best to do it all at once. Not worth taking a chance on your new diodes in your new altinator in my mind.
Seb...
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From: Fruitland MO
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Some of the one wire setups need to see rather high RPM's before they start charging.
That is about the only drawback though.
I have a friend that installed a Power Master one wire on his gasser, and he complained it did not charge.
So I went on the Power Master site and found that they must see 2500 to 3000 RPM before they start charging.
You would have to take the pulley diameter difference into consideration to calculate that alternator RPM into engine RPM though.
That is about the only drawback though.
I have a friend that installed a Power Master one wire on his gasser, and he complained it did not charge.
So I went on the Power Master site and found that they must see 2500 to 3000 RPM before they start charging.
You would have to take the pulley diameter difference into consideration to calculate that alternator RPM into engine RPM though.
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Senior User
Joined: May 2005
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From: Fruitland MO
I have 3 powermasters on other projects with no complaints....in fact the one on my crawler does 157A at idle. I have messed with 12 volt electronics all my life, I had just never heard of the diode issue...guess cause I usually replace the alternator the very first thing lol. I am not a 3G guy honestly, we tried one on 2 different crawlers and they wouldn't keep up with the injection much less the winch, lights, stereo etc. I know some people have great luck with them, I just don't take chances anymore 
Thanks for all the help diagnosing my issue!
Thanks for all the help diagnosing my issue!
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