Bouncing voltmeter
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Laughing Gas
Joined: Mar 2011
Posts: 1,229
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Bouncing voltmeter
My voltmeter (91 Explorer) bounces with loads, i.e. when sitting at a stop light with the brake lights and turn signal on.
Revving the engine up doesn't seem to help.
What does this indicate? Bad battery? Bad alternator or voltage regulator?
Revving the engine up doesn't seem to help.
What does this indicate? Bad battery? Bad alternator or voltage regulator?
Logistics Pro
Joined: Jun 2009
Posts: 4,819
Likes: 83
From: Cedar Rapids, IA
The easiest way to check would be to use a multimeter on the battery with the engine running, then have someone sit in the vehicle, apply the brakes, and turn on the turn signal. See what the battery voltage does. If the battery voltage is around 13.5-14.4 VDC and pretty stable, the issue is probably either a connection or possibly voltage regulator on the instrument cluster itself. I don't know if your '91 Explorer has a regulator that is dedicated to the instrument cluster. It's been years since I've seen such a set up.
If the voltage on the battery is below probably 12.5VDC and drops with the turn signal flashes, the issue is at least with the alternator or wiring between it and the battery and probably the battery as well.
-Rod
If the voltage on the battery is below probably 12.5VDC and drops with the turn signal flashes, the issue is at least with the alternator or wiring between it and the battery and probably the battery as well.
-Rod
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Laughing Gas
Joined: Mar 2011
Posts: 1,229
Likes: 1
The easiest way to check would be to use a multimeter on the battery with the engine running, then have someone sit in the vehicle, apply the brakes, and turn on the turn signal. See what the battery voltage does. If the battery voltage is around 13.5-14.4 VDC and pretty stable, the issue is probably either a connection or possibly voltage regulator on the instrument cluster itself.
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