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Discussion Forum

8070 alternator problems

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06-02-2003 18:41:59

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I have an 8070 with a Niehoff alternator that has given me plenty problems since I bought this tractor. First it did not charge at all and now I am having problems with overcharging and cooking the batteries. I recently had it repaired where they installed a new regulator although they could not find a problem on their test stand. I have sent it off twice in the past year to be repaired and now again it is putting out up to 17 volts wide open throttle. I have checked my ground wires and they seem to be good. Any tips on what else to check would help or do I just have a bum alternator.

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06-02-2003 19:11:53

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 Re: 8070 alternator problems in reply to Scott, 06-02-2003 18:41:59  
an alternator sences battery voltage and puts out enough current (with approx a steady voltage) to keep it charged. If the wiring to the battery and alternator were corroded and there was some loss of "signal" to the alternator, then it might overcharge. However at 17 volts, i believe you probably have a bad regulator. ONe option you might consider is getting a standard DELCO alternator from NAPA or AUTO ZONE and replacing entire. MIght have to do a little modification in the mounts. Ask for a DELCO built between 1975-1985 with the internal voltage regulator. They are the lowest cost $40.

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Steve in N.J.

06-03-2003 04:55:54

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 Re: Re: 8070 alternator problems in reply to steve, 06-02-2003 19:11:53  
Scott, You could possibly have a wire rubbed through somewhere on the machine thats causing just enough of a draw to start signaling the alternator to charge. Do a real close inspection of the wiring system to make sure there isn't any bare spots, pinched, or damaged wires or connections to cause the signal to happen. Some of the larger alternators like Leece/Nevilles etc have external regulators which are a little more sensative to draw because of the things that need to be powered up on certain vehicles. A draw like that could cause the battery or batteries or one of the components in the system to fry if not caught soon enough. Good move on checking the grounds first! Usually it's the simple things that cause the problems... Good Luck! And, keep us posted....
Steve/B&B Custom Circuits

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