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Old 02-13-2014, 12:22 PM   #1
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Alternator 200 Amp vs 270 Amp

I am replacing the alternator in my 2000 HR Navigator, Cummins engine. I currently have a 200 amp Leece Neville connected to a DUVAC system. I am replacing that with a 270 amp Leece Neville also DUVAC. Is this safe and will I cause any damage ?
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Old 02-13-2014, 04:04 PM   #2
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Safe.. Likely, The major danger is you might fry a f useable link.

the job of the link, like any fuse, is to sacrafice itself to prevent other damage. They are a bit "messy" when they fuse though.
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Old 02-13-2014, 04:14 PM   #3
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Im pretty sure any DUVAC dual voltage functionality has been neutered long before your coach was built and is not using it any capacity - it was not uncommon to see DUVAC's being used since so many powerplant/chassis combos were being used for firetrucks, which many were/are 24vdc. Check with whomever you are purchasing the new alternator from to see if you can get by with just a single wire (self excited) type. And honestly I'd get that Leece Neville rebuilt before I would buy a Delco.

Nonetheless, I would avoid going to a higher amp rated alternator for two reasons:
1) The wiring back to your batteries is sized for the OEM, which I assume is 200amp and will melt if subjected to 250amps for any reason.

2) The battery isolator used is most likely rated at 200amp as well and could be burnt up/damaged too.
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Old 02-15-2014, 08:30 PM   #4
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Quote:
Originally Posted by 94-Newmar View Post
Im pretty sure any DUVAC dual voltage functionality has been neutered long before your coach was built and is not using it any capacity - it was not uncommon to see DUVAC's being used since so many powerplant/chassis combos were being used for firetrucks, which many were/are 24vdc. Check with whomever you are purchasing the new alternator from to see if you can get by with just a single wire (self excited) type. And honestly I'd get that Leece Neville rebuilt before I would buy a Delco. Nonetheless, I would avoid going to a higher amp rated alternator for two reasons: 1) The wiring back to your batteries is sized for the OEM, which I assume is 200amp and will melt if subjected to 250amps for any reason. 2) The battery isolator used is most likely rated at 200amp as well and could be burnt up/damaged too.
thanks for the information, you are right, it is a 200 amp Isolator. I just replaced it because I thought it might have been damaged when my alternator went out. After installing the new rebuilt 270 amp alternator (repair shop bumped it up from 200 to 270) I started the couch and it registered 14 volts. I turned everything in the couch on, inverter, tv, refer, stereo and left them on for about twenty minutes. After 15 minutes or so the voltage fell to 12+ volts. I shut the coach down and checked the alternator, it was extremely hot. I notified the alternator shop and the owner told me I have a short somewhere because the alternator was pulling a load. Anyone know where I should start looking? Could it be the big solenoid located on the battery boost?
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Old 02-15-2014, 09:25 PM   #5
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Quote:
Originally Posted by Rehbergl View Post
thanks for the information, you are right, it is a 200 amp Isolator. I just replaced it because I thought it might have been damaged when my alternator went out. After installing the new rebuilt 270 amp alternator (repair shop bumped it up from 200 to 270) I started the couch and it registered 14 volts. I turned everything in the couch on, inverter, tv, refer, stereo and left them on for about twenty minutes. After 15 minutes or so the voltage fell to 12+ volts. I shut the coach down and checked the alternator, it was extremely hot. I notified the alternator shop and the owner told me I have a short somewhere because the alternator was pulling a load. Anyone know where I should start looking? Could it be the big solenoid located on the battery boost?
I am not sure you have anything wrong. Depending on whether or not your coach batteries are charged. When I hook up to shore power with just the coach batteries charging that is 19 amps at 115vac, that would be 170 amps at 12vdc. depending on how much for refer. If tv is an amp that would be 11 amps at 12vdc plus stereo etc. You are probably working that alternator pretty hard. Plug into shore power charge all your batteries all the way up. Turn off everything you can then start and see if your alternator gets hot. Also 14 volts for alternator is not that big a deal. Alternators put out a minimum of 13.8 volts and vary from 13.8 to 14.7
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Old 02-16-2014, 07:07 PM   #6
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How weak was your batteries when you started the coach.a 270 amp alternator would get seriously hot trying to charge dead batteries.As gemini mentioned charge the batteries and see what happens.
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Old 02-17-2014, 06:34 AM   #7
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Out of town will check the batteries when I return
Thanks everyone!
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Old 02-20-2014, 07:43 AM   #8
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Back Home

Got back to the MH last night, did as you suggested, the batteries were fully charged and I turned everything off. Ran the engine for 10 minutes then checked the alternator, cool as a cucumber. I turned my inverter on and ran it another 10 minutes. The alternator got hot but not as hot as before. Output reading was around 13.9 to 14.
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Old 02-21-2014, 09:40 PM   #9
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Big solenoid

Should the motor start with house and chassis batteries turn off at the battery box disconnect? I suspect I have a bad or stuck battery boost solenoid. Motor starts with everything turned of even the salesman switch.
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