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#1
03-03-2020, 12:22 PM
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Bad voltage regulator?
Hi all
I just put a new alternator, battery, shock tensioner, drive belt on my 1992 om602 w124 After it was all back together got it running with the old battery still in and noticed that the battery light was still on after it was running for a bit, so I put in my brand new battery I had, battery light was still on. Took the car to autozone for an battery alternator check , the auto zone guy said my battery was a little low so he put it on the charger for about 3o minutes, reinstalled the battery started it up. Battery light still was on the dash, so I drove it around a bit when I floored it the battery light went out along with the abs light which had also been on. Fast forward to last night battery is dead as a door nail. I also noticed that none of my idiot lights come on when I turn the key. When the car was running and I put a multi meter to the battery it was only 11.6 volts with the car running with head lights and fan it was down to 10 volts. What could it be? Ground strap on the bottom of the engine? Bad voltage regulator in a new alternator ? Relay? Iam at my wits end Thank you Ken Willmann 
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#2
03-03-2020, 12:25 PM
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Sorry I meant to post this to diesel discussion
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#3
03-04-2020, 09:41 AM
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Low Charge Rate
It's a simple thing to test the alternator in situ, all it needs is 12 VDC at both terminals then the voltage should rise to 13 ~ 14 VDC at the out put terminal .
Isolate and test the alternator first then look for bad grounds etc.
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#4
03-06-2020, 07:46 AM
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Was the belt put back on the right run if not the alternator now might be running in reverse
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#5
03-06-2020, 08:31 AM
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Alternators don't care which direction they run in....
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#6
03-07-2020, 08:05 AM
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No may be not but the rest of the system wont like it .
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#7
03-07-2020, 09:11 AM
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The alternator can run in any direction. It's an AC device. The rectifier plate will convert it to DC to power the car and charge the battery. Direction doesn't matter at all.
On any given engine, the belt will only turn the alternator in one direction anyway, regardless of how it's routed, so it's a moot point.
__________________
Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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#8
03-07-2020, 03:23 PM
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THANK YOU !
Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#9
03-08-2020, 11:23 PM
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I forgot if these alternators have a fan on the pulley or not. That has to turn the right direction.
__________________
To see my 129 parts for sale visit: John Roncallo
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