| Alternator replacement [message #260975] |
Fri, 05 September 2014 11:29  |
Bill Shourt
Messages: 33
Registered: January 2005
Location: Sherman Oaks ,Ca
Karma: 0
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My alternator is getting tired and was wondering about replacing it with a 100 amp unit. would anything else need to be changed? Pros and cons? Thanks for your advice.
Bill and Michele Shourt
78 Kingsley, origional
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| Re: [GMCnet] Alternator replacement [message #260991 is a reply to message #260975] |
Fri, 05 September 2014 13:52  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Confirm your isolator(if so equipped) is a 100 amp model and not a 60 amp.
Todd Sullivan
Sully
77 royale
Seattle
> On Sep 5, 2014, at 12:29 PM, Bill Shourt wrote:
>
> My alternator is getting tired and was wondering about replacing it with a 100 amp unit. would anything else need to be changed? Pros and cons?
> Thanks for your advice.
> --
> Bill and Michele Shourt
> 78 Kingsley, origional
> _______________________________________________
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Alternator replacement [message #260994 is a reply to message #260991] |
Fri, 05 September 2014 14:06 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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On Friday, September 5, 2014, gene Fisher wrote:
> If you are going to replace the alt. would be better to have it rebuilt
> by a local shop.
> Tell them to replace all insides..sometimes takes 3 or 4 NAPA REBUILDS
> TO GET A GOOD ONE
>
> ERF
> On Friday, September 5, 2014, Todd Sullivan > wrote:
>
>> Confirm your isolator(if so equipped) is a 100 amp model and not a 60 amp.
>>
>> Todd Sullivan
>>
>> Sully
>> 77 royale
>> Seattle
>>
>>> On Sep 5, 2014, at 12:29 PM, Bill Shourt wrote:
>>>
>>> My alternator is getting tired and was wondering about replacing it
>> with a 100 amp unit. would anything else need to be changed? Pros and cons?
>>> Thanks for your advice.
>>> --
>>> Bill and Michele Shourt
>>> 78 Kingsley, origional
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Alternator replacement [message #260996 is a reply to message #260975] |
Fri, 05 September 2014 14:10 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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You might consider adding a # 8 or 10 wire in parallel with the existing wire that connects the alternator to the isolator to take advantage of the higher charging ability of the 100 amp alternator.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Alternator replacement [message #261027 is a reply to message #260975] |
Fri, 05 September 2014 20:18 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Just do it. Make sure you specify the correct part number for the Cadilac 100 amp alternator. The look the same as the 80 you now have.
All of these other upgrades are nice but can be done when you have time. The standard 80 isolator use on the GMC will conduct 80 amps per leg meaning 80 to the engine and 80 to the house side. So that is not an issue. I have had a 100 amp alternator and the original 80 amp isolator for many years. It is still working.
You are next to never going to put out 100 amps. It will only put out what the loads will accept. The biggest advantage of the 100 amp alternator is that alternator will put out more current at an idle and slower speeds.
As for the larger wire between the alternator and the isolator. Go ahead and do it but what about the wires are between the isolator and loads. No one ever seems to think those are a problem. The larger wire will have less voltage drop but even so that is not an issue since the alternator remote senses the voltage and makes up for any losses in that wire. That said my wire is larger only because I had an engine fire and when I replaced the wiring I used a #8 gage wire because I had one around.
One thing you might look at is putting a double pulley on that new alternator before installing it. On mine I simply asked at the counter at AutoZone and they changed it for free. Even if you have to buy one, they are usually less than $10.00. Put it on now and use only the single belt. You can switch to a double belt later as a different project.
Again, none of the above is absolutely necessary. You can just swap the alternators and go on your way. If it is working, I would keep the old one as a spare rather than turn it in for the core charge.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Alternator replacement [message #261038 is a reply to message #261035] |
Fri, 05 September 2014 22:35 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Mine came for AZ and works great. Life time warranty is also great as long as I do not try to replace it in Canada. Dan got 3 from AZ before he got a good one.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Alternator replacement [message #261040 is a reply to message #260975] |
Fri, 05 September 2014 22:40 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Bill Shourt wrote on Fri, 05 September 2014 10:29My alternator is getting tired and was wondering about replacing it with a 100 amp unit. would anything else need to be changed? Pros and cons? Thanks for your advice.
I would increase the gage of the red output wire or add a second one in parallel. When I went to the 100amp. that wire would get pretty warm.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Alternator replacement [message #261041 is a reply to message #261027] |
Fri, 05 September 2014 22:44 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Ken, the rebuilt AZ units I have used come with a new machined pulley rather than the stamped pulley found on many units. I still feel that many slipping issues are caused by worn pullies obviating the need for dual pullies. Just my observation.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Alternator replacement [message #261044 is a reply to message #261041] |
Sat, 06 September 2014 01:09 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Those those pulleys do wear over time so a new one at rebuild is a good idea. My point was if you put the double pulley on it when you have it out, it only takes a minute to change at the store.
Then you have the option of going either way later on. I did not realize AZ was getting replacement alternators from Cardone with new pulleys. Mine came with new stator windings and a new regulator (I took it apart). The rotor appeared to be reused though the slip rings were shiny like new. The brushes and bearings also looked new. I never really bothered to look at the pulley at the time because I had already decided to go with the double pulley.
I also changed the alternator wire to 8 ga. because I had some high temperature insulation wire around that was used on the furnaces in the local steel mills. In a previous life, I was a steel mill electrician for a while.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Alternator replacement [message #261072 is a reply to message #261044] |
Sat, 06 September 2014 12:31 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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I have run the Autozone DL7157 alternator for years back to1999 when first installed on the first coach. Had one failure in 11 years and it was a lifetime replace item, did cost me a dime. After a while I did upgrade to a #8 wire to the isolator to take care of the warmness of the original #10 wire.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Sep 6, 2014, at 2:09 AM, Ken Burton wrote:
> Those those pulleys do wear over time so a new one at rebuild is a good idea. My point was if you put the double pulley on it when you have it out,
> it only takes a minute to change at the store.
>
> Then you have the option of going either way later on. I did not realize AZ was getting replacement alternators from Cardone with new pulleys. Mine
> came with new stator windings and a new regulator (I took it apart). The rotor appeared to be reused though the slip rings were shiny like new. The
> brushes and bearings also looked new. I never really bothered to look at the pulley at the time because I had already decided to go with the double
> pulley.
>
> I also changed the alternator wire to 8 ga. because I had some high temperature insulation wire around that was used on the furnaces in the local
> steel mills. In a previous life, I was a steel mill electrician for a while.
>
>
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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