Why is alternator heating up?

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555RAT
Posts: 47
Joined: Sun Feb 24, 2008 8:59 am
Location: Central Oregon

Why is alternator heating up?

#1 Post by 555RAT » Tue Jun 07, 2011 11:51 pm

Alright, I just noticed this after putting my engine back in. With the engine OFF, the alternator heats up. I just happened to notice the pulley was warm so I checked the rest of it and it's definitely warm without the engine running. This is a 3 wire denso mini mounted to the frame(engine is mounted with a motor plate) so I'm sure it's grounded good. Anyone else notice this or have this issue?
Thanks,
Keith
8.90@149 and 3,000lb, no Juice, no boost!

JES
Posts: 84
Joined: Tue Feb 17, 2009 10:29 pm

Re: Why is alternator heating up?

#2 Post by JES » Wed Jun 08, 2011 12:11 am

Could your polarity be reversed? Battery charge backward? Is the 555 back in or just a converter change?

Deborah-WFO
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Location: Phoenix
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Re: Why is alternator heating up?

#3 Post by Deborah-WFO » Wed Jun 08, 2011 1:09 am

Silly question, but is the ignition somehow on, or something in that circut shorted? Seems like its getting juice from somewhere




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555RAT
Posts: 47
Joined: Sun Feb 24, 2008 8:59 am
Location: Central Oregon

Re: Why is alternator heating up?

#4 Post by 555RAT » Wed Jun 08, 2011 2:35 am

This is happening when the electric cutoff is on and all switches are in the off position. I haven't even charged the battery from the last race yet! Thanks for the input.
Keith
8.90@149 and 3,000lb, no Juice, no boost!

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supernova
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Re: Why is alternator heating up?

#5 Post by supernova » Wed Jun 08, 2011 6:58 am

Your alt should be wired straight to the battery with no cut off in between. Being a 3 wire alt, one wire to the alt is a trigger wire from the ignition and is the off-on circuit for the alt. If that wire remains hot the alt will keep the circuit in the closed to allow power from the battery to back feed in the alt.
Or the circuit in the alt has gone bad and won't open the to stop the connection to the battery.
More than likely the alt has gone bad and won't turn off the circuit.

Hope that helps. I use a 1 wire alt just to prevent this type of problem.
Blackhoodmafia!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.28
mph: 134
new wt. 3340 lbs

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