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Alternator wiring

xaisomboun

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Joined
Jun 19, 2011
Messages
117
Location
Minnesota
I bought a new Beck/Arnley reman'd alternator and my car still only runs at about 13.2 volts max and sometimes even dips down into the 9.x range randomly. I'm thinking it has to do with the black voltage regulator plug because the wires on mine seem to be mangled and burnt.

Does anyone have any idea where those wires on the plug go to? I'm planning on just soldering brand new wires onto it and route them somewhere away from all the heat.
 

xaisomboun

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Joined
Jun 19, 2011
Messages
117
Location
Minnesota
Correct me if in wrong but there are 3 wires going into the alternator. 1 charge wire and 2 off the plug. One wire off the plug should be a constant 12v from the battery and the other should be a ground right??
 

EHmotorsports

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Sep 25, 2012
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1,278
Location
Beaverton
Correct! And I would address the connectors. What is the standing voltage of the battery right now?

My apologies I did not see the part where he was asking about the ground. Iceman is correct!
 
Last edited:

iceman69510

Turn Right Racing
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Mar 5, 2001
Messages
10,939
Location
Michigan
It is not a ground. the S terminal is battery voltage, the L is wired through the ignition switch and charge indicator light.
 

xaisomboun

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Joined
Jun 19, 2011
Messages
117
Location
Minnesota
Quoting iceman69510:
It is not a ground. the S terminal is battery voltage, the L is wired through the ignition switch and charge indicator light.



I'm assuming the S terminal is the thicker wire right? I want to re-wire the plug with new wires but I'm at a loss on where to wire them to??
 

EHmotorsports

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Sep 25, 2012
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1,278
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Beaverton
Ok great I just wanted to make sure you didn't have a dead cell or a battery on its way out.
 

transparentdsm

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Jul 27, 2011
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3,689
Location
Klamath Falls, Or
Quoting xaisomboun:
Quoting iceman69510:
It is not a ground. the S terminal is battery voltage, the L is wired through the ignition switch and charge indicator light.



I'm assuming the S terminal is the thicker wire right? I want to re-wire the plug with new wires but I'm at a loss on where to wire them to??



just cut open the wiring bundle and trace it back from the alternator. main wire goes to battery positive and on plug one is ignition relay and the other is the main relay
 

rgeier11

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Joined
Sep 26, 2004
Messages
726
Location
Chicago Suburbs, IL
Here is a wiring diagram.

click


Here is a gvr4board upload of the same pic.
 
Last edited:

xaisomboun

Well-known member
Joined
Jun 19, 2011
Messages
117
Location
Minnesota
Quick question! I have an APEXi pen style turbo timer with the volt meter on it and it usually reads around 12.7 volts but when I measured the voltage at the battery with the car on it was 14.2 volts.

Should I trust the turbo timer or just ignore it and buy a legit volt gauge?
 
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