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 Molex seems good - charging light still on 
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Joined: Mon Mar 15, 2010 12:46 pm
Posts: 739
Location: Crystal Beach ON CAN
Post Molex seems good - charging light still on
Hi all,

I know this subject has come up many times, but I'm having an issue that I can't seem to understand. I recently replaced my fan shroud mounting plate. Whilst off, I checked out my Molex (as I always had a faint charging light on, but no real charging issues) and found a couple of bad connections. I replaced the offensive spade connections and put everything back together. Now my alternator light is on bright and constant, but I'm having no charging issues. I run mostly short distance, but do stop / start the engine quite frequently, so I figured the batteries would have suffered low charge if there was an issue. I've been running like this for a few weeks now. I'm not incredibly savvy with electronics, but I did presume that if I had a bad connection that my batteries would eventually tell the tale. Any quick thoughts are of great assistance.

tx Dave

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1972 710m


Thu Jul 20, 2017 10:51 am
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Joined: Thu Jul 29, 2004 2:12 pm
Posts: 720
Location: Indio, California
Post Re: Molex seems good - charging light still on
Bad diodes, bad grounds, loose belt. Pull the alternator and have it bench tested. Then check all connections and grounds. The regulator could be bad, or have a bad ground. The battery terminals could be loose or corroded. That's most of what could cause your electrical problem.


Last edited by pinzinator on Fri Jul 21, 2017 7:44 am, edited 1 time in total.



Thu Jul 20, 2017 8:44 pm
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Joined: Mon Mar 15, 2010 12:46 pm
Posts: 739
Location: Crystal Beach ON CAN
Post Re: Molex seems good - charging light still on
Thanks Pinzinator, I will have to pop her out again and see what's up.

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1972 710m


Fri Jul 21, 2017 4:59 am
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Joined: Wed Apr 14, 2004 9:58 pm
Posts: 1346
Location: Idyllwild, CA
Post Re: Molex seems good - charging light still on
Having actual voltmeter measurements will tell a world of information beyond the "idiot light". What voltage are your batteries when at rest for an hour or two? (expect ~25V). What voltage do you get when the engine is cranking? (over 20V is good). What voltage do you get once the engine is running, preferably a bit higher than idle speed? (expect ~27-28V). All these should be measured at the battery terminal (not the battery clamp around the terminal). Let us know what you get.

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Jim M.
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Fri Jul 21, 2017 7:40 am
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Joined: Mon Mar 15, 2010 12:46 pm
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Location: Crystal Beach ON CAN
Post Re: Molex seems good - charging light still on
Jimm391730 wrote:
Having actual voltmeter measurements will tell a world of information beyond the "idiot light". What voltage are your batteries when at rest for an hour or two? (expect ~25V). What voltage do you get when the engine is cranking? (over 20V is good). What voltage do you get once the engine is running, preferably a bit higher than idle speed? (expect ~27-28V). All these should be measured at the battery terminal (not the battery clamp around the terminal). Let us know what you get.


I was hoping you would chime in! I will perform these tests and report the findings.

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1972 710m


Fri Jul 21, 2017 7:44 am
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Joined: Sat Oct 24, 2009 5:17 pm
Posts: 859
Location: arizona
Post Re: Molex seems good - charging light still on
Take a good look at the wiring under the front tin behind the alternator. We have seen many of the wires down to one or two strands left at the connectors to the alternator. Sounds like you have covered the main molex connector already but make sure the back side of the connector is in good shape, so many focus on the outboard side and let the inside go.


Sun Jul 23, 2017 3:16 pm
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Joined: Sun Dec 10, 2006 7:38 pm
Posts: 1219
Location: Southwest Wisconsin
Post Re: Molex seems good - charging light still on
4x4Pinz wrote:
Take a good look at the wiring under the front tin behind the alternator. We have seen many of the wires down to one or two strands left at the connectors to the alternator. Sounds like you have covered the main molex connector already but make sure the back side of the connector is in good shape, so many focus on the outboard side and let the inside go.


Very good point! I've found problems there a couple of times. It's relatively inexpensive to replace that internal harness ($23) and is available from SAV (https://www.pinzgauer.com/showdetails.p ... 7121090090) and probably EI also. By replacing that harness you also get a new half of the molex connector. If it looks good except for 1 or 2 wires it's also easy to splice and repair the original if you prefer.

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Sun Jul 23, 2017 4:12 pm
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Joined: Mon Mar 15, 2010 12:46 pm
Posts: 739
Location: Crystal Beach ON CAN
Post Re: Molex seems good - charging light still on
4x4Pinz wrote:
Take a good look at the wiring under the front tin behind the alternator. We have seen many of the wires down to one or two strands left at the connectors to the alternator. Sounds like you have covered the main molex connector already but make sure the back side of the connector is in good shape, so many focus on the outboard side and let the inside go.


Yes, good observation. I did actually discover when I took, off the shroud, the alternator came with it and the smaller of the two wires broke right off. I replaced the connection and all is good now. We had a big pub crawl on Saturday so didn't get a chance to look at it. Sunday was a hangover day to say the least. :wink:

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1972 710m


Mon Jul 24, 2017 5:07 am
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Post Re: Molex seems good - charging light still on
Nice

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Mon Jul 24, 2017 3:19 pm
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