Overcharging problem - question
#1198327
03/17/12 11:09 AM
03/17/12 11:09 AM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,296
Chicago, IL
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Hey Guys - Have a 67 Coronet wagon with a overcharging problem. Tried 2 new voltage regulators, 2 alternators, new engine wiring harness, sanded down mating surface of voltage regulator to ensure a good ground (with strap to engine) and still overcharging. It will pin the gauge needle to the charge side (18v) on aftermarket gauge and does the same with the factory dash gauge. It has also been confirmed on a auxillary gauge that it is in fact overcharging.
Havn't found any obvious wiring mixups, so I'm a little stumped as to why I still have an overcharging issue. Would it be easier to just get an internally regulated alternator, or is that just a band aid for a potential wiring problem?
What are your thoughts? Thanks
2 kids and a dog
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Re: Overcharging problem - question
[Re: TonyS451]
#1198330
03/17/12 11:40 AM
03/17/12 11:40 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Wiring prob. Disconnect ALL field wires then use jumper wires with alligator clips to connect batt positive to reg "ign". Jump connect reg "field" to alt field terminal. You're sure the alt/reg are grounded to batt neg properly. See if it behaves now & if so that'll confirm that it is a wiring prob. If not then the alt or the reg (more likely) is it. mechanical or electronic reg? Could have gotten a bad reg. If you confirm it is wiring then replace 1 jumper at a time with its OE lead till you find the culprit. Do the one at a time wiring changes with the eng off. I'm assuming your batt is fully charged and the large cables/batt terminals (positive an neg circuits) are cleaned. Sure sounds like a bad reg, something is full fielding it. EDIT do not go w an internally regulated alt
Last edited by RapidRobert; 03/17/12 11:46 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Overcharging problem - question
[Re: TonyS451]
#1198333
03/17/12 04:49 PM
03/17/12 04:49 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,817
Rio Linda, CA
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I know the OP states it's a '67 but does it have the original single field connection alternator or has it been upgraded to a dual field connection alternator?
The INTERNET, the MISinformation superhighway
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Re: Overcharging problem - question
[Re: TonyS451]
#1198336
03/17/12 05:52 PM
03/17/12 05:52 PM
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Joined: Dec 2010
Posts: 1,035 Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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What does it charge with the voltage regulator unplugged? If it is still overcharging even while unplugged, the green field wire to the regulator is shorted to ground.
392 gen III hemi on E-85 727 trans Dana 60 10.02@134
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Re: Overcharging problem - question
[Re: 71yelladustr]
#1198337
03/17/12 06:04 PM
03/17/12 06:04 PM
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Joined: Jan 2003
Posts: 4,270 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,270
Morrow, OH
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Check the voltage regulator ground. If the ground is poor it will think the voltage is lower than it really is.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Overcharging problem - question
[Re: jamesc]
#1198339
03/17/12 07:31 PM
03/17/12 07:31 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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Disconnect the ground control field wire (usually green) from the alternator terminal, if it stops overcharging the wiring is the problem. Check the control wire for a short to ground between the alternator and regulator. If it still overcharges with the wire off there is an internal short to ground.
The INTERNET, the MISinformation superhighway
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Re: Overcharging problem - question
[Re: John_Kunkel]
#1198340
03/17/12 11:23 PM
03/17/12 11:23 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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on the 2 field circuit system you pretty much just need switched 12V via the blue wire circuit to (1) the the top terminal in the VR triangle connector with the "top" being with the triangle being "up" like a pyramid and (2) T ing off of it to either one of the male alt field terminal (blue wire). Then the green wire runs from the "side" VR terminal to the other alt male field terminal. Is that what you currently have wired? That's all you need for the field circuit to make it charge
live every 24 hour block of time like it's your last day on earth
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Re: Overcharging problem - question
[Re: jamesc]
#1198344
03/19/12 05:21 PM
03/19/12 05:21 PM
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Joined: Jan 2003
Posts: 25,817 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
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If it's overcharging, both the regulator and alternator are getting battery voltage.
Since both the alternator and the regulator have been changed twice it's pretty safe to say there is a short in the field wire between the alternator and the regulator; most common place is where it runs along the valve cover.
The INTERNET, the MISinformation superhighway
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