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02-20-2007, 14:25

Don: I've had a few alternator problem's with my 93pt a few years
ago. It was always the # 2 alternator, that's the one on the left
side of the engine . After replacing the alternator 2 time's bluebird
finally convinced me to just eliminate it and use the # 1 alternator
only, it's the one on the right side next to the bumper. I've not had
any problem's since going to the single alternator. I use it to
charge 8--series 31 house batteries plus the 3 engine start. Never a
problem since and we do some dry camping. I believe that the problem
with the # 2 alternator is due to the fact that the grounding cable's
are too small. I now carry that extra alternator in the part's box
in case I need it. It's much easier to replace the # 1 alternator
than # 2. Also..A common problem is that one fail's and you don't
know it till the other one fail's and then you have nothing. The
alternator check switch #1--#2 is generally not reliable I would not
spend much time or much trust in the integrity of this switch.

Work's for me;;;;;;;Bob 93pt-40

- In WanderlodgeForum@yahoogroups.com, "Don Bradner" wrote:
>
> I've got a few questions after I describe what I'm seeing on my
dual-alternator 8V92:
>
> After starting, the voltage is somewhat below 13, and alt2 is
running about 50 amps. Alt1 is essentially zero, although there is a
slight upward blip when changing the display from alt2 to both.
>
> Voltage slowly rises, and after quite a distance (100 miles or
more) the voltage is in the 13.5 range. At around that time, the
Fault light comes on. Alt2 at this point is running around 25 amps,
and there is no apparent increase in the both position.
>
> What do other 8V92 dual-alternator owners see for charge rates, 1,
2, and both? I'm presuming the zero/near zero is telling me I have a
bad alternator, but is the 50 amps from Alt2 also low? If it is, what
does that mean?
>
> Does anyone know, on theirs, which alternator is 1 and which is 2?
Front top, or back by the bumper?
>
> Don Bradner
> 90 PT40 "Blue Thunder"
>