M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Fuse box grounding location

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Old 05-09-2013, 10:17 PM
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2003 ML500
Fuse box grounding location

I'm trying to hardwire my V1 in the fuse box in the passenger footwell of my '03 ML500.

I think I know which fuse I'm going to tap (the blue one) using the Direct-Wire Power Adapter Kit, but I have no idea where to ground it.

I tried loosening the bolt that connects the brown cable (the grounding cable I believe) but there's no room to maneuver in there and I can't loosen it.

Do you guys have any idea where or how I can ground the wire? And while we're at it, any suggestions on which fuse to tap?

Thanks.
Old 05-10-2013, 05:54 AM
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2002 ML 320 & 2006 ML500
Remove the entire footwell paneling to gain access to the entire fuse/relay box.

Never tap off a fuse.

The stud on the fuse box with the Brown/Tan wire is ground.

Then there will be another stud with a Red wire. This is the stud where battery voltage is delivered constantly, whether the key is on or off. Circuit 30.

Then there will be another stud which will only show battery voltage when the key is turned to pos. #2. Circuit 15r.

Attach your wires according to the requirements of the component you are installing.
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Last edited by Maj. Dundee; 05-10-2013 at 06:20 AM.
Old 05-10-2013, 08:36 AM
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Originally Posted by Maj. Dundee
Remove the entire footwell paneling to gain access to the entire fuse/relay box.

Never tap off a fuse.

The stud on the fuse box with the Brown/Tan wire is ground.

Then there will be another stud with a Red wire. This is the stud where battery voltage is delivered constantly, whether the key is on or off. Circuit 30.

Then there will be another stud which will only show battery voltage when the key is turned to pos. #2. Circuit 15r.

Attach your wires according to the requirements of the component you are installing.
Thanks, that's a huge help. As you can see, I'm not the most electrically inclined person out there

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