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Voltage Regulator/Low Voltage Help

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Old 02-13-2019, 01:41 PM
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03 E55
Voltage Regulator/Low Voltage Help

Did some research but couldn't find anything to help me so here goes,

About 2 weeks ago i was driving home and had a battery malfunction light appear on my dash and had shut down a lot of my electronic components but it ran perfectly fine. I heard a pulley sound also. I was about a mile away from home so decided not to pull over. Restarted the car a few times and same thing no fix (forgot to check the voltage) and also smelt like burnt plastic when i opened the hood. Figured my voltage regulator was shot and it was. Got a new voltage regulator from the stealership and I installed last night after having both batteries disconnected for almost 2 weeks. Tried to start the car but no power. Jumped it and had a abs light on and the idle didn't seem right. Turned it off and jumped again and everything seemed fine.

I take it for a drive and not even a block down the abs light turns on, car had shut down all electronics, red message about battery and sbc came on, and voltage was dropping my the seconds. I opened the hood and smelt the burnt plastic again along with a pulley noise.

Jumped the car again and let it run, after 5 minutes started idling weird so i shut it off.

I'm guessing its the alternator that took a ****. Anything special you have to do after installing a new regulator, can the battery die from being disconnected for almost 2 weeks?

Old 02-13-2019, 07:07 PM
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2005 e55 AMG
No. But you did drain the battery from driving and not charging. The diodes are more than likely smoked. Get a new Bosch alternator and call it a day.
Old 02-13-2019, 09:32 PM
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You don't replace the voltage regulator in a 13-16 year old car, you replace the complete alternator. And make sure your battery is good, or new- and the proper type (AGM) and capacity so you don't ruin the new alternator.

Last edited by E55Greasemonkey; 02-13-2019 at 09:34 PM.
Old 02-14-2019, 09:15 AM
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What he said!
Old 11-09-2019, 03:21 PM
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Well if nothing else we pull fuse #6, leave it overnight and see where we are come morning. Then we will at least know that circuit is the problem....

Need to find the wiring diagram, like I know how to read them. Im good on mechanicals, but Im no sparky...

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