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Old 05-28-2016, 12:53 PM   #1
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Alternator problems 3208T 85 Beaver Marquis

hey everybody, well just finished the new starter,changed out a delco 42mt for one of the new 39mt gear reduction starters,running great, the 30 lbs vs 60 lbs was the dealmaker for me. But,i dont beleive my alternator is charging....have 12.4 at my new chassis battery and 12.8 at my coach batteries...i get these same numbers at the isolator posts with the engine off.....with the engine running i still have 12.4 at the battery posts and the isolator post...i have 12.4 at the battery terminal on the alternator....the posative terminal on the alternator which runs to my isolator reads .4 volts with the engine running,i also get the same .4 volts at the isolator terminal from the alternator ?????.......had the alterator off and tested at a truck electric shop and the said the alterator was perfect,165 amps....?????...im not sure what to do next,thanks,steve
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Old 05-28-2016, 01:06 PM   #2
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Sounds like the exciter supply to the alternator is gone. Could be a blown fuse. Not sure where to look on your coach but pretty sure that's your problem.
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Old 05-28-2016, 01:15 PM   #3
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With a diode isolator in the system, the alt need to sense chassis battery voltage for the internal regulator to work.

Make sure there is a source for that on the alt.

It may be marked DuVac.

If this is a new issue after the starter change, the sense wire could be connected wrong on the starter.
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Old 06-01-2016, 08:13 PM   #4
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resolved alternator

thanks everybody as it turned out a small white wire was attatched to the middle regulator post along with the jumper wire,at the time looked as if it was comming from the fuel solonoid....so disconnected it to concentrate on the lack of charge going to the isolator....upon closer inspection of a bundle of zip tied wires i discovered a second white wire which actually was the correct fuel solonoid wire and that the aternator white wire was actually a four inch splice to a four inch black wire spliced to a green wire...once i discovered the green wire found reference to same in the wiring diagram as being the tach connection,tho this wire belonged on the third regulator post not the second....after reconnecting i regained the tach function and to my amazement the isolator began charging both coach and chassis at 13.5 volts.....long road and a little wheel but finally my engine compartment is purring like a kitten(ok,maybe more like a bear with oggida)...thanks again...now on to the refrigerator,steve
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Old 06-01-2016, 09:17 PM   #5
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Just Keep On Keeping On.....
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