Battery Indicator Oscillating

For awhile the needle would oscillation between the normal 50-60% position a few degrees after driving a half hour or more with the headlights on. Then I cleaned all the connections in the starting systems from battery terminal to hot connections and grounds, and the problem stopped.

Then last week, I had driven to a store at dusk with the lights on - no problem indicated. I left the lights on for 20 minutes while in the car. Then when I started, the battery needle start oscillating from 50% to 100% regularly, and the warning light started blinking.

Car was running fine so I turned off the headlights and just put on the parking lights so I could drive the 2 miles home. After driving about

1/2 mile the oscillating and flashing stopped.

I have tried to duplicate the problem so I could show a mechanic, but all is back to normal for now.

Without knowing anything, I would guest that the computer detected some kind of low voltage and the swinging and flashing was an attention-getter, and not the actual reading.

Any ideas how to troubleshoot this?

Reply to
Snuffy "Hub Cap" McKinney
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On Fri, 20 May 2016 14:06:36 -0700, "Snuffy \"Hub Cap\" McKinney" wrote in

You probably already did this: have battery checked

Reply to
CRNG

Thanks, is that something that can be checked before it acts up again?

Reply to
Snuffy "Hub Cap" McKinney

shorts. had that happen once, it was terrible and couldnt be found. the battery was pretty new.......

bent, and must of intermittetly shorted

Thanks BH. Will check it out. I remember that the meter started slightly cycling from time to time when the headlights were one before the battery was replaced.

Reply to
Snuffy "Hub Cap" McKinney

Or the brushes are worn out.

Reply to
clare

Sadly, the answer is basically no. You MIGHT be able to trick it into misbehaving again by putting a carbon pile load tester on the battery to draw down the voltage with the vehicle running - but I wouldn't count on it. That's why, knowing the problem was in the alternator, and having already replaced the regulator and brushes once on mine, I simply replaced rhe alternator when it started intermittently doing it again. I couldn't be bothered digging deaper into it for the $30 cost of a used, very recently rebuilt unit from the local "used parts emporium"

Reply to
clare

Thanks. $30 is a bargain. Alternators here are $150 new with lifetime warranty, $100 rebuilt w/ 1 year. If it were easier to swap out, that's what I would do. Still looking for a way to isolate to battery or alternator first. Already checked that connections are all good.

Reply to
Snuffy "Hub Cap" McKinney

and OEM new alternators are closer to $600.

I checked the wreckers and took the best one they had - had been installed less than 2 weeks bdfore the car was wrecked and cost the same as a 10 year old one.

Reply to
clare

the headlights on -- but does happen every time. Any ideas how to troubleshoot it?

position a few degrees after driving a half hour or more with the headlights on. Then I cleaned all the connections in the starting systems from battery terminal to hot connections and grounds, and the problem stopped.

no problem indicated. I left the lights on for 20 minutes while in the store. Then when I started, the battery needle start oscillating from

50% to 100% regularly, and the battery warning light started blinking off and on.

the parking lights so I could drive the 2 miles home. After driving about 1/2 mile the oscillating and flashing stopped.

but all is back to normal for now.

some kind of low voltage and the swinging and flashing was an attention-getter, and not the actual reading.

Reply to
Snuffy "Hub Cap" McKinney

"Snuffy "Hub Cap" McKinney" wrote in message news: snipped-for-privacy@earthlink.com...

the headlights on -- but does happen every time. Any ideas how to troubleshoot it?

position a few degrees after driving a half hour or more with the headlights on. Then I cleaned all the connections in the starting systems from battery terminal to hot connections and grounds, and the problem stopped.

no problem indicated. I left the lights on for 20 minutes while in the store. Then when I started, the battery needle start oscillating from

50% to 100% regularly, and the battery warning light started blinking off and on.

the parking lights so I could drive the 2 miles home. After driving about 1/2 mile the oscillating and flashing stopped.

but all is back to normal for now.

some kind of low voltage and the swinging and flashing was an attention-getter, and not the actual reading.

Reply to
Snuffy "Hub Cap" McKinney

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