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Gjac
Milford, CT
Senior Member
Joined: 08/16/2006
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Good Sam RV Club Member
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Your alternator if original is probably around 80 amps. When mine went out on the road I replaced it with a 180 amp one which was able to charge my 2 6vGC house batteries as well as the chassis battery. If you go to a shop that rewinds motors and alternators, they can rewind one using your same case. I would check the alternator yourself before you remove it to see if it is actually bad. Jump start the MH and check to see if you can read 14v or so on the battery if so, it is still good. If not move up to the alternator output itself and see if it is outputting 14v's, if so, you may have a fuse or bad wire to the battery, if not you know for sure the alternator is bad. Just because you have new batteries doesn't mean your alternator is bad because the engine won't start. It maybe something as simple as corroded or loose wires to the battery or even a starter issue.
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Matt_Colie
Southeast Michigan
Senior Member
Joined: 10/09/2011
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Evelyn,
Simple start of a diagnostic tree:
If it doesn't start after sitting, it is the batteries.
Charge the batteries.
If it still doesn't start, look for a bad connection to the starter.
If it started once and will not start 3~6 days later, you have a parasitic load killing the batteries.
If you take it somewhere and it doesn't want to start to come home, that can be the alternator.
If the lights get dim when running at night, that it the alternator.
Early in the game, buy a plug in the lighter volt meter. Running you should see 13.5~14.5 Volts. After sitting should be 12.5~12.6. After three days, it should still say ~12.5.
Cranking, the thing should stay over 10.0 Volts. If it drops below that, you have a problem that needs to be identified.
The year 454 should have a 27SI alternator. They come in lots of flavors. If it has a single sheave pulley, do not install a replacement that is over 100 amp because it can make short work of that single belt.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.
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