C36 AMG, C43 AMG (W202) 1995 - 2000

C43 not charging, dont know why

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Old Nov 18, 2018 | 08:02 PM
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From: West Palm Beach, FL
'99 C43, '88 560SL
C43 not charging, dont know why

Hi all, car has a new altenator and a new battery but I have 11.2 v at the battery and the battery light is on. I tried swapping the relay in that k40 box and I tried grounding the altenator to the frame to see if it was a grounding issue but I dont know where to check next on why this car still has the battery light on.any sugestions on where to check next? Thanks!

Last edited by brad_c43; Nov 18, 2018 at 09:22 PM.
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Old Nov 19, 2018 | 12:08 AM
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1999 C43, 2008 P30 E63, 2014 SQ5, 2024 Model Y Performance
Originally Posted by brad_c43
Hi all, car has a new altenator and a new battery but I have 11.2 v at the battery and the battery light is on. I tried swapping the relay in that k40 box and I tried grounding the altenator to the frame to see if it was a grounding issue but I dont know where to check next on why this car still has the battery light on.any sugestions on where to check next? Thanks!
Start the car and then disconnect the battery. If the car dies then you have an issue with your alternator, if it continues to run then the problem is most likely with the battery. Even though both are new there could still be issues with them.

This is where I would start
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Old Nov 19, 2018 | 12:12 AM
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1999 C43, 2008 P30 E63, 2014 SQ5, 2024 Model Y Performance
just found this

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Old Nov 19, 2018 | 03:06 AM
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From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Nice, I had forgotten about that trick

Fubabox has loads of How To videos.
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Old Nov 19, 2018 | 11:35 PM
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Turns out, while I was told this was a reman Bosch unit the reman parts were very cheap in quality. The voltage regulator is bad
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