IHC 684 alternator problems

Gleanerguy · May 16, 2013

Recently my 684 has stopped charging (I get only 12.25 volts while running). Last year I had the alternator rebuilt by a good shop nearby. I took it back to them and had it tested and they said it is good. So I have a wiring problem.

I dread having to tear apart the wiring to figure this one out. I think it takes a 205 ohm resistor in there somewhere to get it running? As you know they use a Lucas alternator. I would prefer to just put a Delco-Remy one wire alternator in, but they are quite a bit larger in diameter and will not fit. The Lucas alternator just fits, I can just barely slip the belt off with it loosened up all the way. It would have to be something of the same or slightly smaller diameter to work.

Anyone have any helpful suggestions?

Harold Evans · May 16, 2013

I would start with a multimeter to see where the voltage is lacking. Test the voltage coming out of the alternator first to see if your belt is slipping. If that looks good, go down the harness until you find the problem. I'll bet it is a loose fitting or a dirty connections of some sort.

Gleanerguy · May 16, 2013

The belt is good, but I would bet that you're right, it is probably a dirty or loose connection somewhere.

Janicholson · May 16, 2013

If you do not find a loose connection or failed component. and want to change to a delco, consider a Hitachi from a 86 Nissan D21PU it is wired like a Delco with the L connection = to Delco #1, and the S = to #2 Jim

Janicholson · May 16, 2013

Hitachi # 14231 Jim

JimB2 · May 16, 2013

Hi, my brother has a 684 and the Lucas alternator quit on it several years and I was able to fix it by repair the ground that contacts the opposite end of the drive shaft from the drive pulley. I just cannot recall exactly what the repair was but it did involve either brazing the end of the shaft or the strip of metal that contacted the shaft. This metal strip provided the ground for the rotor and without the ground the alternator would not charge.

A few years later the Lucas died again and my brother went to local auto scrap yard and bought a Delco. He had to buy a longer fan belt and the guard over the alternator pulley no longer fit.
It was did the same to his 454 and 495.

JimB

Gleanerguy · May 16, 2013

Would an auto parts store like O'reilly's carry that? Is that a one wire setup? I assume that alternator would include an internal voltage regulator with it?

Janicholson · May 16, 2013

Auto parts do cary the Nissan alt. O do not recommend a one wire setup, they often drain the battery when not used regularly, and do not start charging till RPMs come up. The 3 wire setup is the same as they were used in a car. very reliable and an easy install. The Bob M diagrams show the process. Jim

IHC 684 alternator problems

Gleanerguy

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Harold Evans

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Gleanerguy

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Janicholson

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Janicholson

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JimB2

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Janicholson

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