I don't konw the answer to the cannister problem... But for the other...
If you can locate the isolator, it sits on the left front side of the coach
opening. It has three wires... one from the alternator, and one that goes to
the front battery and the other goes to the back (house) battery. The isolator
is there to isolate the two batteries. It sends energy to both when charging,
but stops one from impacting the other when off. If the isolator is bad it would
not send anything to the back battery. There are lots of ways to check that, by
using a meter to see if the isolator is working...if not, consider replacing it
with a combinror... it does not have the voltage drop across the diodes that
exist on the old isolator.
al
> Hello all:
>
> As a new owner of a 1977 Eleganza II (my first RV), I find this GMC mailing
> list very helpful and informative. For the most part, I've found the systems
> of this vehicle to fairly straight forward and am on my way (hopefully) to
> getting the 23 year-old road worthy again. Our maiden voyage will be a two
> week round trip from Alabama to Arizona - leaving this Thursday (again
> hopefully).
>
> The reasons for this inquiry are two specific problems I've encountered which
> don't seem to have any obvious (to me) solutions. Perhaps someone out there
> has experienced the same and can save me the learning curve in diagnostics?
>
> 1) When filling the fuel tanks, fuel will run out of the bottom of the fuel
> vapor canister before the pump nozzle cuts off. Lots of fuel -- like a
> gallon. It seems like an overfill situation where fuel is pushed through the
> vent line to the vapor canister before it backs up in the filler neck
> triggering the pump nozzle automatic cutoff. Any thoughts on this one? It
> is quite a safety concern as you can imagine.
>
> 2) On a less critical note, the "house" battery is not being charged by the
> engine when running/driving. Perhaps a wiring problem, as it appears things
> in the electrical area have been "monkeyed" with over the years. It charges
> fine via converter with either generator or external power. Talking with a
> friend he suggested that the two batteries should tied together when the
> engine is running but with some sort of diode protection to isolate the two
> batteries when the engine is off. Sounds reasonable to me, but I'm not sure
> where to start (looking).
>
> Obviously, I've not purchased repair manuals yet, but will do so soon. Any
> suggestions?
>
> Thanks in advance to any and all.
>
> Curtis E. Comer
> curtcomer
> '77 Eleganza II
> Hazel Green, AL
If you can locate the isolator, it sits on the left front side of the coach
opening. It has three wires... one from the alternator, and one that goes to
the front battery and the other goes to the back (house) battery. The isolator
is there to isolate the two batteries. It sends energy to both when charging,
but stops one from impacting the other when off. If the isolator is bad it would
not send anything to the back battery. There are lots of ways to check that, by
using a meter to see if the isolator is working...if not, consider replacing it
with a combinror... it does not have the voltage drop across the diodes that
exist on the old isolator.
al
> Hello all:
>
> As a new owner of a 1977 Eleganza II (my first RV), I find this GMC mailing
> list very helpful and informative. For the most part, I've found the systems
> of this vehicle to fairly straight forward and am on my way (hopefully) to
> getting the 23 year-old road worthy again. Our maiden voyage will be a two
> week round trip from Alabama to Arizona - leaving this Thursday (again
> hopefully).
>
> The reasons for this inquiry are two specific problems I've encountered which
> don't seem to have any obvious (to me) solutions. Perhaps someone out there
> has experienced the same and can save me the learning curve in diagnostics?
>
> 1) When filling the fuel tanks, fuel will run out of the bottom of the fuel
> vapor canister before the pump nozzle cuts off. Lots of fuel -- like a
> gallon. It seems like an overfill situation where fuel is pushed through the
> vent line to the vapor canister before it backs up in the filler neck
> triggering the pump nozzle automatic cutoff. Any thoughts on this one? It
> is quite a safety concern as you can imagine.
>
> 2) On a less critical note, the "house" battery is not being charged by the
> engine when running/driving. Perhaps a wiring problem, as it appears things
> in the electrical area have been "monkeyed" with over the years. It charges
> fine via converter with either generator or external power. Talking with a
> friend he suggested that the two batteries should tied together when the
> engine is running but with some sort of diode protection to isolate the two
> batteries when the engine is off. Sounds reasonable to me, but I'm not sure
> where to start (looking).
>
> Obviously, I've not purchased repair manuals yet, but will do so soon. Any
> suggestions?
>
> Thanks in advance to any and all.
>
> Curtis E. Comer
> curtcomer
> '77 Eleganza II
> Hazel Green, AL