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12V battery not charging
#1202996 Sun Feb 05 2017 05:58 AM
Joined: Jun 2008
Posts: 716
U
UnklRod Offline OP
Shop Shark
Hello all,
I did a frame off resto on my 1957 3100 Chevy truck. The truck is bone stock and has a new wire harness installed.
The battery is not charging. I have 11 volts at the battery and 14 at the voltage regulator and generator. Where could the problem be and why the battery is not charging? Could it be at the starter or amp gauge? Can I bypass the gauge and see if the gauge is the problem? How do I do that? There is two red wires at the gauge and one black wire.
Thanks


1957 Chevy 1/2-Ton Truck
In the Stovebolt Gallery
More pix

The coldest winter I ever saw was a summer I spent in San Francisco M. Twain

If at first you don't succeed...skydiving is not for you!

If you don't like my carbon foot print, stick it up your Prius!!
Re: 12V battery not charging
UnklRod #1203033 Sun Feb 05 2017 04:16 PM
Joined: Feb 2004
Posts: 20,618
H
Boltergeist
Which terminal at the regulator has the 14V? If the "Bat." terminal is showing that voltage the problem is between the regulator and the battery, possibly an internal open circuit at the ammeter. Temporarily, remove all the wires from the ammeter and bolt them together. If the voltage rises at the battery terminals, replace the ammeter.

There are several other possibilities. You really need to find someone who can do a detailed circuit trace, as it's almost impossible to cover all the possible problems long distance unless you have an extensive background doing electrical work.
The "new wire harness" concerns me- - - -there are a lot of ways to get a wrong connection.
Jerry



The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 12V battery not charging
UnklRod #1203051 Sun Feb 05 2017 06:39 PM
Joined: Jun 2004
Posts: 8,202
W
Master Gabster
First try polarizing the gen. Touch a piece or wire from the bat term. to the arm. term. at the regulator. If that doesn't do it put a test wire between the bat. term. on the regulator to the pos. post on the bat. If it works then you have an open in the circuit which could be the amp. meter. Test the amp. meter like HRL said. Another test is to ground the field term at the gen. or reg. & try it.
George


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 12V battery not charging
UnklRod #1203070 Sun Feb 05 2017 09:31 PM
Joined: Jun 2008
Posts: 716
U
UnklRod Offline OP
Shop Shark
Thank you guys.
Forgot to mention the gen has been rebuilt and new volt reg. I did polorize. When I sent the gauge cluster out to be rebuilt I wonder if they used cheap China parts for the gauges.
Will bypass the amp gauge and see what I get.

Thank you.


1957 Chevy 1/2-Ton Truck
In the Stovebolt Gallery
More pix

The coldest winter I ever saw was a summer I spent in San Francisco M. Twain

If at first you don't succeed...skydiving is not for you!

If you don't like my carbon foot print, stick it up your Prius!!
Re: 12V battery not charging
UnklRod #1203342 Tue Feb 07 2017 05:54 PM
Joined: Jun 2004
Posts: 8,202
W
Master Gabster
Make sure the grd. . & fld. wires from the reg. to the gen. are not crossed. It's easy to do.

Last edited by Wrenchbender Ret.; Tue Feb 07 2017 05:55 PM.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 12V battery not charging
UnklRod #1203647 Fri Feb 10 2017 01:29 AM
Joined: Jun 2008
Posts: 716
U
UnklRod Offline OP
Shop Shark
Hi guys,
I removed all three wires from the back of the amp gauge. Still showing 11.3 volts at the battery. 14V at volt regulator and generator. Could it be the wire coming from the BAT wire on the regulator?


1957 Chevy 1/2-Ton Truck
In the Stovebolt Gallery
More pix

The coldest winter I ever saw was a summer I spent in San Francisco M. Twain

If at first you don't succeed...skydiving is not for you!

If you don't like my carbon foot print, stick it up your Prius!!
Re: 12V battery not charging
UnklRod #1203652 Fri Feb 10 2017 01:53 AM
Joined: Feb 2004
Posts: 20,618
H
Boltergeist
You still haven't told us WHICH wire at the regulator has the 14 volts. If it's only the ARM wire, you have a bad regulator. If the BAT wire at the regulator is showing 14V you have an open circuit between the regulator and the back of the ammeter. Try running a temporary 10 gauge jumper wire from the BAT terminal of the regulator to the battery cable attached to the starter and then check the battery terminal voltage with the engine at fast idle.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 12V battery not charging
UnklRod #1203655 Fri Feb 10 2017 02:16 AM
Joined: Jun 2008
Posts: 716
U
UnklRod Offline OP
Shop Shark
Thank you Jerry,
Sorry about that. There is 14V at the BAT and at ARM. I ran a wire from the BAT side of the volt reg to the starter. There is 14V at the wire I ran but when I attach to the starter and check the battery it is still showing 11 volts.


1957 Chevy 1/2-Ton Truck
In the Stovebolt Gallery
More pix

The coldest winter I ever saw was a summer I spent in San Francisco M. Twain

If at first you don't succeed...skydiving is not for you!

If you don't like my carbon foot print, stick it up your Prius!!
Re: 12V battery not charging
UnklRod #1205071 Mon Feb 20 2017 06:19 AM
Joined: Jun 2008
Posts: 716
U
UnklRod Offline OP
Shop Shark
Problem fixed. Voltage regulator not grounded.


1957 Chevy 1/2-Ton Truck
In the Stovebolt Gallery
More pix

The coldest winter I ever saw was a summer I spent in San Francisco M. Twain

If at first you don't succeed...skydiving is not for you!

If you don't like my carbon foot print, stick it up your Prius!!

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