The final story on this is that we worked on it a couple of hours and traced wires and checked isolator and found that there was 12 volts on the nichrome exciter wire to the alternator.
But it still wouldn’t start. It sure seemed like an open wire somewhere.
Bruce finally opened the alternator on the bench and checked all wires and connections and brushes.
He put it back together and installed it and it is now producing over 14 volts.
Probably a bad internal connection or a stuck brush.
Emery Stora
77 Kingsley
Frederick, CO
>
> Worked on the charging system all afternoon. Cleaned and wire bushed all
> connections, rechecked isolator-ok ,installed charged battery12.7 volts,
> Found what I thought was a good alternator was also bad (light circuit
> fault), and retested remanufactured alternator and it failed.
>
> Did what Johnny suggested and crimped apc and plug end of wire harness.
> Will need another good alternator to see if that effort helped.
>
> Thanks everybody for your input, Emery will help me try to sort this out
> tomorrow.
>
> On Wed, Jul 10, 2019 at 7:26 PM Ken Burton via Gmclist <
>
>> I'll second Johnny's recommendation on the alternator plug. I had a
>> similar problem going to a GMCMI rally in Georgia. Upon our arrival, I
>> removed
>> the alternator. Colonel Ken gave me a ride to the auto parts store. They
>> tested it and gave me a new one. (They did not know how to test it
>> correctly but I said nothing because I wanted a new one.) Upon
>> installation, it failed exactly the same way. Additional diagnosis, which
>> I should
>> have done prior to removing the alternator in the first place, found a
>> poor connection at the plug on the alternator. A little additional crimping
>> pressure applied with a pair of pliers to the female connectors
>> permanently fixed the problem.
>>
>> Check clean and add additional pressure to the female side on connectors.
>> If you have an APC squeeze those female connectors too.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
But it still wouldn’t start. It sure seemed like an open wire somewhere.
Bruce finally opened the alternator on the bench and checked all wires and connections and brushes.
He put it back together and installed it and it is now producing over 14 volts.
Probably a bad internal connection or a stuck brush.
Emery Stora
77 Kingsley
Frederick, CO
>
> Worked on the charging system all afternoon. Cleaned and wire bushed all
> connections, rechecked isolator-ok ,installed charged battery12.7 volts,
> Found what I thought was a good alternator was also bad (light circuit
> fault), and retested remanufactured alternator and it failed.
>
> Did what Johnny suggested and crimped apc and plug end of wire harness.
> Will need another good alternator to see if that effort helped.
>
> Thanks everybody for your input, Emery will help me try to sort this out
> tomorrow.
>
> On Wed, Jul 10, 2019 at 7:26 PM Ken Burton via Gmclist <
>
>> I'll second Johnny's recommendation on the alternator plug. I had a
>> similar problem going to a GMCMI rally in Georgia. Upon our arrival, I
>> removed
>> the alternator. Colonel Ken gave me a ride to the auto parts store. They
>> tested it and gave me a new one. (They did not know how to test it
>> correctly but I said nothing because I wanted a new one.) Upon
>> installation, it failed exactly the same way. Additional diagnosis, which
>> I should
>> have done prior to removing the alternator in the first place, found a
>> poor connection at the plug on the alternator. A little additional crimping
>> pressure applied with a pair of pliers to the female connectors
>> permanently fixed the problem.
>>
>> Check clean and add additional pressure to the female side on connectors.
>> If you have an APC squeeze those female connectors too.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Bruce Hart
> 1976 Palm Beach
> Milliken, Co
> GMC=Got More Class
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
