Tonka,
Your battery charging problem, as you may already know, is a classic
example of an isolator failure. The diode to the chassis battery has
opened. That causes the voltage sense lead to the alternator (connected to
the chassis battery) continuously telling the alternator's regulator that
the output needs to be increased. Since that increased voltage cannot
affect the chassis battery, only the house battery receives it, and
overcharges. Most GMC alternators are internally limited to 18 VDC output,
but I've seen a couple go to 28 VDC -- dangerously high.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com
On Wed, Jul 3, 2019 at 9:01 PM tonka6cuda6--- via Gmclist <
> Well gotta say we pulled it off....1500km later the Hughes 2600 is home.
> Little hick up with the house battery over charging and the motor one not
> being charged at all. Good thing im a mechanic by trade and brought tools
> as we swapped the batteries back and forth once they started to boil.
>
> So 2 things to sort out so far....over charging/no charging and a leaking
> air compressor but not the valves to the bags or the bags.
>
> Other minor stuff but ill go threw all the electrical etc....
>
> Overall was a hoot!! 55 to 65mph or 100 to 110kph all the way home except
> for the odd hill were we raced the trucks up at no less than 60kpm....lol.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
Your battery charging problem, as you may already know, is a classic
example of an isolator failure. The diode to the chassis battery has
opened. That causes the voltage sense lead to the alternator (connected to
the chassis battery) continuously telling the alternator's regulator that
the output needs to be increased. Since that increased voltage cannot
affect the chassis battery, only the house battery receives it, and
overcharges. Most GMC alternators are internally limited to 18 VDC output,
but I've seen a couple go to 28 VDC -- dangerously high.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com
On Wed, Jul 3, 2019 at 9:01 PM tonka6cuda6--- via Gmclist <
> Well gotta say we pulled it off....1500km later the Hughes 2600 is home.
> Little hick up with the house battery over charging and the motor one not
> being charged at all. Good thing im a mechanic by trade and brought tools
> as we swapped the batteries back and forth once they started to boil.
>
> So 2 things to sort out so far....over charging/no charging and a leaking
> air compressor but not the valves to the bags or the bags.
>
> Other minor stuff but ill go threw all the electrical etc....
>
> Overall was a hoot!! 55 to 65mph or 100 to 110kph all the way home except
> for the odd hill were we raced the trucks up at no less than 60kpm....lol.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
