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08-27-2015, 01:04 AM
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#1
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2 Rivet Member
1981 28' Airstream 280
Lisle sur Tarn
, France
Join Date: Aug 2014
Posts: 89
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upgrade alternator
Hello. I would like an alternator more powerful on my Excella. But without any other modification ( wires / univolt / batteries separator/...) . Please, what power max would you advise me to buy ( and brand, type). Thank you. Marc
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08-27-2015, 02:53 AM
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#2
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Retired.
Currently Looking...
.
, At Large
Join Date: Jun 2003
Posts: 21,276
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Without modifying wiring or mounting brackets, you will need to stick with the Delcotron type. How many amps is your current one?
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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08-27-2015, 05:53 AM
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#3
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Airstream Driver
1994 30' Excella
1992 35' Airstream 350
Austin
, Texas
Join Date: Feb 2002
Posts: 5,224
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1984-81 GM 7.4L(454) - MG Industries Inc.
I don't know much about their alternators, just been using their excellent, trouble free starters
__________________
1994 30' Excella Front Kitchen Trailer
1990 25' Excella Travel trailer
1992 350LE Classic Touring Coach
AIR #13
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08-27-2015, 06:44 AM
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#4
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Rivet Master
2005 34' Classic S/O
2006 39' Land Yacht 396 XL
north blenheim
, New York
Join Date: Sep 2012
Posts: 2,847
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Rock Auto is your best bet on a Factory new alternator (Delco) brand new about $80.00....Keep your original as a spare. You may also want to replace all battery cables as age becomes an issue with voltage drop problems. The second phase of my overhaul includes replacing all chassis 12 volt wiring pertaining to alternator,isolater,starter.
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08-28-2015, 08:00 AM
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#5
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2 Rivet Member
1981 28' Airstream 280
Lisle sur Tarn
, France
Join Date: Aug 2014
Posts: 89
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Ok. I don't know amperage but I have a problem of priming (? , initiating ? I don't know the right word ). I have to run the motor about 3000 rm to start alternator and get between 12.5 - 13V...perhaps the regulator ?
Alternator Mean Green seems very powerful ( gain 300% !!! )...
Rock Auto is cheaper.
Sure, I have to change all big wires which are cracked.
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10-04-2015, 01:16 AM
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#6
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2 Rivet Member
1981 28' Airstream 280
Lisle sur Tarn
, France
Join Date: Aug 2014
Posts: 89
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ok, my alt is 63 Amp. can I change it with a 100 Amp. without problem (isolator ? )
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10-04-2015, 01:33 AM
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#7
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Rivet Master
1974 31' Sovereign
1979 23' Safari
Wayland
, New York
Join Date: Jan 2012
Posts: 1,632
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Yes, the rating tells you max amps it can put out, if doesn't always put that many amps out. The voltage regulator will regulate how many amps it will actually put out. Over rated is ok as long as it physically fits in the space available.
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10-04-2015, 08:11 AM
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#8
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Rivet Master
1974 20' Argosy 20
Richmond
, Kentucky
Join Date: Jan 2003
Posts: 9,116
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You also need to verify the wire gauge size from the alternator to the isolator. It needs to be considerably heavier for a 100 amp alternator compared to a 63 amp unit.
Odds are your motorhome is already properly equipped as I think the motorhomes came with higher output alternators than stock. When it comes time to replace the original alternator it's usually an emergency and most people end up going to their local parts store and buying whatever alternator they can get their hands on which is usually a lower output unit.
Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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10-06-2015, 05:21 AM
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#9
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2 Rivet Member
1981 28' Airstream 280
Lisle sur Tarn
, France
Join Date: Aug 2014
Posts: 89
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bkahler, I think you'r right and alternator of excella is more powerful than 63A.... I am just ordering a 140A (!!!) to Summit Racing (120 us$ / 220usd with shipping and taxes). I will change the wire from alt to isolator and....wait and see .
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10-06-2015, 10:31 PM
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#10
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2 Rivet Member
1981 28' Airstream 280
Lisle sur Tarn
, France
Join Date: Aug 2014
Posts: 89
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And I change also my isolator with that for 45 $ : Victron Cyrix battery combiner (12/24v-120A) : better than a diode system !
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