Masters degree credit available for alternator charging question

[Richard Gideon]

I agree with Shane's posting...also, do not overlook a mechanical
issue such a loose set of alternator belts. If the belts are worn
out or slipping badly they need to be replaced. Most difficult to
diagnose from afar. Sign up and attend one of the many rallies held
across the country...some of us are starved to get 'hands on'
troubleshooting experience! Sounds like your batteries are quite
undercharged...upgrade those obsolete battery boilers if you you have
not changed them yet.

Dick Gideon
1989 35FC
Rolla, MO

--- In WanderlodgeForum@yahoogroups.com, "hippieforever3"
wrote:
>
> I'm posting this here rather than the FC forum bcause it may be a
> generic issue across models.
>
> I've looked a few diffent versions of the charging / starting
> schematics and can't find anything that explains what I'm seeing.
>
> Consider this sequence;
> 1. Turn on master power switch in the battery compartment
> 2. Observation - dash voltage is showing 12+ to 13V, no current
> 3. Turn ignition key
> 4. Observation - dash voltage momentarily drops to 10.5V
> 5. Engine starts
> 6. Observation - Dash voltage rebounds to approx. 11.5V, no current
> 7. Momentary tap on the throttle, approx. 1500rpm or more
> 8. Observation - Dash current now showing +50a to 100a, voltage
starts
> to climb toward 13-14 volts
>
> It's steps 6 - 8 that mystify me. I can understand the voltage
> rebounding after the starter surge but why no current before
revving
> the engine?
>
> This implies a relay somewhere that only kickes in after a little
rpm
> rev. I don't see it on any of the various BB schematics I've got.
Is
> there an internal relay in the alternator?
>
> Has anyone else seen this or do I have some "custom" configuration?
>
> Movin on,
> GPSGary
> 1984FC35
>