alternator problems

rip · March 04, 2016, 06:13:55 AM

I have a 85 Prevost with a 8v92 with a DN/50 alternator that quit charging.I had it check out and were fairly certain the problem is in the alternator and not the regulator.
Has anyone removed the D50 and run a external alternator. AT one point it had a alternator which appears ran off the camshaft pulley,but has been removed.
Don

Scott & Heather · March 04, 2016, 06:34:22 AM

Don they make the 50DN in a belt drive model if that would make your life easier? Still oil cooled though. They also make. 55SI that is belt driven and air cooled producing about 275 amps at 24 volts.

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Boomer · March 04, 2016, 09:36:58 AM

Detroit Diesel made a standard alternator bracket that bolted to the block heater plate holes and used the cam pully. Might take some work to track one down though.

Lee Bradley · March 04, 2016, 10:45:13 AM

You might try these guys. Looks like they have a lot of engines they are parting out.

http://www.ebay.com/usr/cathyster

rip · March 04, 2016, 02:43:53 PM

I found the bracket at Prevost,however if I remove the DN50 do they make a plate cover for that.

sixtyseven · March 04, 2016, 09:30:31 PM

Don, I also have a 85 Prevost and did just what you are talking about. Yes they make a cover for that, if I remember correctly it is the same as one of the others back there. I installed 2 belt drive alternators, one 12 volt and one 24 volt. I made my own brackets and have been very happy with the belt drives. Also you can pick what ever amp alternators you want instead of being stuck with mega-amp.

rip · March 05, 2016, 04:32:28 AM

If you can post a few photos would be great.If it would be easier you can text me the photos at six 0 two,677-8148.Thanks

sixtyseven · March 05, 2016, 12:21:40 PM

I will take some photos and text them, then if I can figure out how I will post them also

luvrbus · March 05, 2016, 07:28:24 PM

If you have the 8 inch bolt pattern 50D with the aluminum spacer they don't make a cover for it that I have ever been able to locate,I remove the planetary gear from the cam and cut one to fit

rip · March 07, 2016, 09:12:54 AM

Thanks for the photos.Can you tell me what 24 volt alternator and diameter of the pulley you used.Thanks,Don

jackhanow · March 07, 2016, 05:49:27 PM

I fashioned a bracket and attached it to the lavatory frame and ran the belt to the crank pulley. I used a Delco 225 amp marine alternator and only charge my house batteries with it because I didn't want to cause any problems with the vanner thing. Could have done the same with a regular 100 amp but wanted to make sure in case I wanted to add some things later.

TedCalvert · March 08, 2016, 04:03:40 AM

This probably won't help you much, but I like to hear myself type.

My '86 came to me with a reman engine, with a belt-driven air-cooled alternator. So enough steel, rod and wire and it can be done. Have fun.

chessie4905 · March 08, 2016, 04:10:25 AM

If you have access to a HD truck junk yard, you could get the parts thee off a DDA. They used air cooled alternators on them.

sixtyseven · March 09, 2016, 12:06:50 AM

The 24 volt alt. ( upper one in photos ) is a 65 amp Delco 27-SI series with a 2 1/2" pulley. The lower part of the bracket I believe is the one Boomer was talking about that's made by Detroit. The 12 volt has a 3 3/4" pulley.

Scott & Heather · March 09, 2016, 05:14:19 AM

Sixty seven, um. Is that an 8v71? 92 series? I just don't recognize it because I've never in my life seen one so clean. That's insane.

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