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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 02-22-2008
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jyclegg jyclegg is offline
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Default Alternators

Any comments or suggestions on repair or replacement of alternators. I have a 88WB with 8V92 with 2 alternators. One puts out nothing. The other wants to cook the batteries. It puts out, but no regulation. Any ideas what I should do? Thanks.
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  #2  
Old 02-22-2008
Bikeboy57 Bikeboy57 is offline
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Most alternator shops can rebuild them for you, including fixing the regulator. Typically that will be a lot more economical than buying a new or rebuilt replacement. If you do decide to go with new, McNeese seems to be the heavy duty standard.

You might want to check your batteries with a hydrometer to make sure you don't have a dead cell. A dead cell will trick the alternator into trying to charge the battery when it doesn't need it, which usually results in boiling it dry and cooking your alternator.
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  #3  
Old 02-22-2008
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i always buy new ones,re-building a 20year old alternator is a **** shoot,IMO.
they replace the bad part,and it works for now,but when will the other 20 year old
parts break?
i replace with NEW leese-neville alternators,i get them at the freightliner dealer in ocala fl.
they sell me new ones for around $140 each.
(i get a deal!)
Randy
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  #4  
Old 02-22-2008
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I chose to replace. I don't get Randy's discount, but they were well under $200 each as I recall. I used a pair of 160 amp units; One of the ones being replaced was 160 and one was 135.

These are pretty standard alternators for trucks.
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  #5  
Old 02-22-2008
jwasnewski jwasnewski is offline
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I did the same as DonB. Mine had one 160 and one 135 amp unit. My drawings call for two 160 amp. units. All has been well since.
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  #6  
Old 02-22-2008
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Thumbs up dual alt

I replaced my 160amp unit with a new 320amp Leece-NeVille. Wasn't sure how to get 2 alternators to work together on the same loads. Seems the regulators would get cornfused.

The 320amp alt takes care of business very well. Buy them new on E-Bay for $500.
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  #7  
Old 08-21-2009
Rick Davis Rick Davis is offline
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On the #1 alt (which I assume is the one out front and most accessable) I get a bit of needle movement on the guage, but on the #2 (which I assume is the one at the back of the engine) I get zilch. Assuming the one that works is even weak, I thought I would replace it with a new one and carry a spare, or replace both.

I read references in various posts to both 160 amp and 320 amp alternators. To an electrical dummy, is the only difference (other than price of course) that the bigger one will charge batts quicker? And if getting the 320 amp, would any changes be needed to the regulator or anything?
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  #8  
Old 08-21-2009
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I may be wrong,but trying to run a 320Amp alternator with the same belt set up is not going to work long.
It will be hard on belts.
Stick with the 160s and you will be fine.
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  #9  
Old 08-21-2009
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I would also be concerned about wire size. If you jump to 320 amps and the wiring is sized for 160 amps you would need to run a larger wire.
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  #10  
Old 08-22-2009
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I'd stick with the 160amp Leece-NeVille. They are easy to get on the road. I upgraded my old '78 with one of these for about $170.
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