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Old 02-11-2020, 02:53 PM
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ML55 gone nuts, electrical issue

Ď02 ML55 has had an intermittent issue with the engine shutting off. This has been an ongoing problem for years but so infrequent I only addressed the issue two years ago.
I found a badly corroded feed thru connector located on the firewall behind the battery box.
All was well for several months then all the sudden everything came on during a stop at a red light.
Headlights, wipers, horn, flashers and every warning light on the instrument cluster was lit.
I pulled fuses to shut things off. Disconnected the battery to see if it would reset.
Nothing resolved it. I have to leave the battery disconnected to prevent current draw.
Other than this weird problem the truck is in great shape, low miles and new tires.
Any ideas where to start? I am technically incline and have repaired modules before but this is just too weird.

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  #2  
Old 02-12-2020, 12:04 PM
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Check for signs of water (damp carpet) at the front footwell, both sides. Also at the fuse box behind the R/F kick panel.
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Old 02-12-2020, 12:45 PM
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Quote:
Originally Posted by ILUVMILS View Post
Check for signs of water (damp carpet) at the front footwell, both sides. Also at the fuse box behind the R/F kick panel.
No water ingress.
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Old 02-16-2020, 03:18 PM
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I have reseated all connections in the fuse box. I also pulled the All activity module and examined it for cold solder joints and oxidation. Nothing abnormal found.
I suspect a goofy AAM.
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  #5  
Old 02-16-2020, 04:07 PM
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All but 2 of the 24 relays in the main fuse box are active as soon as the battery is connected. Key not in the ignition.

I reseated all connections in the fuse box. Also removed the all activity module and examined its PCB for broken solder joints.
Nothing abnormal there.

Puzzling.

Iím suspecting a bad AAM.
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  #6  
Old 02-16-2020, 04:54 PM
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Can anyone point me to an online wiring diagram for the W163?
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  #7  
Old 02-18-2020, 11:18 AM
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Parts guy at the MB dealer says he thinks itís a failed rear SAM unit.
Lol. I donít think it even has one. 🤣🤣🤣
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  #8  
Old 02-18-2020, 12:00 PM
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No SAM-R on 163's.....
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  #9  
Old 02-18-2020, 12:24 PM
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Originally Posted by ILUVMILS View Post
No SAM-R on 163's.....
Nope. Idiots

Probing around I discovered I have zero volts on fuse 15 and 16 engine compartment fuse box.
I had hoped to obtain or at least look at a diagram today at the dealer. No such luck.

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