This just started.... or at least I just noticed it. With the
headlights on dim and engine warmed up and idling, the brightness cycles
from normal to slightly dim. Cycle time is around a second. When I rev
the engine slightly, they return to normal steady brightness.
When running with or without lights, the ammeter is just right of
center, slightly charging, in the normal position.
I don't suspect a connection -- within the last 2 months, I removed and
cleaned all the battery connections, including regulator and other parts
when I was fixing a grounding issue.
Battery cranks start just fine. No other indications of failing
That is DEFINITELY not the issue, as the alternator is a (generally
anyway) 12 pole 3 phase devive, and is geares about 2:1 from the
crank, so at 500RPM idle would be turning about 1000RPM, making about
60Hz power (if my math is anywhere close to correct) so any cycling
would be in the 1/60th second range -a very high frequency flicker,
not a surge with a 1 second period.
On Tue, 04 Aug 2015 19:11:55 -0500, "Dean Hoffman"
You can be about 90%+ shure the alternator will need replacing within
a month or so, and the unsteady lights at idle will go away when the
alternator is replaced.
How many miles are on this beasty, and how old?? Is it the old
I had the same problem on my '89 - replaced the regulator - no joy.
Replaced the alternator - problem fixed.. I managed to pick up a good
recently replaced rebuild at the wreckers for $30 (about 20 years ago)
dlights on dim and engine warmed up and idling, the brightness cycles from
normal to slightly dim. Cycle time is around a second. When I rev the eng
ine slightly, they return to normal steady brightness.
enter, slightly charging, in the normal position.
and cleaned all the battery connections, including regulator and other par
ts when I was fixing a grounding issue.
speed motor which moves the throttle as needed like when the AC is switche
d on and the idle speed increases. I'd pull the air cleaner so I could see
the throttle body to see if the throttle is being moved by the idle speed c
ontrol motor. The engine control computer could be affected by a dirty mass
air flow sensor which could cause the idle speed fluctuation. (¬?¬)
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