Question about 1991 Buick Regal
Alt. bench tests good/new battery/Alt. puts out 1.4 volts,unless you pull out the fuse for the dash cluster, then it charges at about 13.8 volts. Is this a faulty dash cluster?
The volt gauge turns the alternator on once the engine is running. There could be a short in the circuit board inside the cluster.
Posted on Jul 26, 2013
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Posted on Jan 02, 2017
Have you tried monitoring the voltage across the battery with a meter while trying to start?
You can buy a digital multimeter for <$20 US at electronic stores (such as Radio Shack in the US) or even auto parts stores.
If you have a Harbor Freight tool outlet near you, they are even a lot cheaper and you will be glad to have one when situations such as yours occur.
You gave the battery voltage as '.13' VDC so you may already have a meter but I don't think you wanted to write that you have 13 hundredths of a volt, did you?
The nominal voltage of a charged battery is 12.6 volts and normally falls ~ 2 volts when the starter is running.
Fuses: the can have a break in the element that is close to invisible so use a meter to measure each one of the higher amperage fuses for continuity on the Ohms or diode scale to make sure.
Some change in the way batteries are made have made them behave strangely; I have had several batteries that will not charge even with 20+ volts across them. They draw only milliamperes and that is not charging. I suspect they build sulfates more readily than in past designs.
Posted on Oct 12, 2008
it does not have a relay on the post on the altenator should have battery voltage and with key on should have voltage on the wire in the pigtail with it unplugged if you have that the alt is bad
Posted on Oct 13, 2008
Remove and clean battery cables , replace bolts. Check for power going to the alt. it will not charge unless is has power in the connector wire. When alt is tested get them to tell you how many amps it is putting out, not volts. 12 volts will not charge a battery unless you have the correct amount of amps. I had a napa alt and had this trouble twice. The guy said it was good it had over 12 volts output, but it would not charge battery. I fixed mine with a better quality alt. from another store.
Posted on Jul 19, 2009
SOURCE: Will not charge
you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME
Posted on Oct 22, 2009
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