8V92 alternator questions

[Don Bradner]

Thanks, Rich. I didn't get the blue box - sent you an e-mail a week or so ago
asking if it passed on from you, sounds like it did. I'm going to resend that
e-mail after this one, so let me know if you don't get it.

I'll be home tomorrow; have been somewhat on the road (but sitting a lot in
Arizona) since getting Blue Thunder. Should have a couple of months to go
through everything as carefully as I can to see if I can figure out what's going
on. In 1500 miles the only other thing that has come up was a transient "do not
shift/check tranny" light that occurred towards the end of the long climb up
I-17 near the 6000-foot level. I had left it in Cruise at 62, and it was doing a
lot of up-down shifting. I just backed off and the warnings did not re-occur.
Temps, including tranny temp, were the same as they are the rest of the time
(except when using the retarder, when obviously the transmission temps climb a
lot).

On 2/21/2007 at 3:43 AM g_man1146 wrote:

>Hi Don,
>
>When I got Blue Thunder the alternator fault light would come on
>frequently. BB told me that the internal voltage regulators in the
>alternators were not closely matched and when one alternator cut out
>due to the voltage level being satisfied it triggered a fault.
>Turning on a load such as headlights triggered the alternator to
>start and the light went out. The fault light would cycle on and
>off. The "fix" was to install a time delay relay so a fault would
>have to be present for 15-30 minutes or so before the light would
>come on. Reasoning being that if the alternator really was bad, it
>would stay bad long enough to light the LED. I mention this because
>you may find the time delay relay inside the dash and wonder. There
>should be documentation of this modification in the blue box. If the
>relay circuit is still there, you may have a bad alternator. My
>recollection is that both alternators output similar amperage until
>one cut out.
>
>I didn't forget your pictures and found many. Unfortunately I have
>prints only, no negatives or digital files and am attempting to find
>a service that will scan them all so I can send you the files. If I
>don't find that, I can send them all to you and you can copy the
>ones you want and return the originals to me.
>
>Rich D. '99LXi43' CT
>
>
>--- 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"
>>
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Don Bradner
http://www.arcatapet.net