Posted by Brad Gyde on August 28, 2011 at 20:41:31 from (50.33.205.139):
Hey guys,
So last night, I posted about my "pulsating lights" on my 86 pickup.
Today I tightened up the alt belt a little (not to the point of slipping, as the vac. pump runs off the alternator, and I maintain a good vacuum) but it was a touch loose.
I removed the regulator, and found one post was corroded/rusty, so I cleaned that up, as well as the grounding surface.
I checked grounds, and all seem ok (using multi-tester with one lead on - batt post, probed around with other lead, and all but one showed no resistance, replaced the bad one, then it checked out ok also) I checked the ALT. case and reg. case also.. show to be grounded ok.
What I have decided is this: when the truck is first started (after cranking/glow plugs cycling, etc.) it don't seem to be as bad.. As it will use the voltage to charge. Once the batteries are "charged" it starts to do it noticeably. On a digital voltmeter, it will peak about 14.9 volts, then drop to 13.9-14.1 range within 10-20 seconds, then repeat.
It's hard to say, as a lot of this is "visual" but driving it tonight about dark, it seemed as all the attempts helped some.. but the meter was showing about the same thing I saw last night.
I did a no load and load test per my Chilton's manual, and everything checks out ok there (aside the voltage being "high" at it's peak)
I went to pick up a regulator tonight, but forgetting it was Sunday, the store was closed when I arrived.. Never thought to ask how late they were open, and here I was thinking it was Saturday still.. OOPS
Hoping to get a regulator tomorrow and see if it fixes it.
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