| Re: [GMCnet] [GMCMH-EFI] speaking of alternators... [message #322172 is a reply to message #322171] |
Tue, 15 August 2017 19:16   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Me too. If I upgrade a charging system with a 100 amp alternator, I also
increase the size of the conductor to the isolator. I just automatically
replace the isolator. If the conductors to the boost solenoid are
questionable, I up size them also. That crap, for the most part, is in
need of attention anyway.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
Jim Hupy
On Aug 15, 2017 4:52 PM, "Todd Sullivan" wrote:
> I must be really lucky then. I put in a 100 amp alternator and smoked my 80
> amp isolator very shortly after.
>
> Sully
> 77 eleganza 2
> Seattle
>
> On Tue, Aug 15, 2017 at 2:39 PM, Ken Burton wrote:
>
>> In theory that is true but...
>>
>> A 100 amp alternator will seldom put out 100 amps. If will do it when it
>> is cold and if there is enough of a load but cold batteries do not take
> much
>> of a load until they warm up. Even if it did put out 100, all 100 amps
>> would have to go to one side. (either engine or house but not both. I
> have
>> had a 100 amp alternator for over 12 years with an 80 amp isolator. I
>> bought a 120 amp isolator to replace the 80 but I never had the old one
> go
>> bad.
>> It has been so long ago that I do not remember where I put the
>> replacement. If it worries you replace it or keep a new one as a spare.
>>
>> The biggest advantage of a 100 amp alternator is it will put out more
>> current at an idle or at lower speeds.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
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