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Old 06-04-2020, 01:18 PM   #1
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DC to DC Charger - Convenient Source for D+ Voltage

I'll be installing a DC to DC charger which requires a connection to the D+ voltage on my 2005 E350 (V10) so that it can sense when the engine is running. I was wondering if anyone had a suggestion as to the easiest and most accessible place to tap into this.

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Old 06-05-2020, 06:25 AM   #2
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It could change by vehicle, so you really need to track down by yours. For my 2004 V10 central junction box fuse F2.12 is hot when the engine is in run. A fuse tap works pretty well here.



You can also tap into wire at the ignition switch connector in the steering column. This is commonly where SMB connects with a fuse.



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Old 06-05-2020, 06:40 AM   #3
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Thanks, Greg, that's leading me in the right direction. My #12 is labeled "Back-up lamps, Auxiliary battery relay (gasoline engine only), Trailer tow relay", which makes sense, but I'll check it with my multimeter to be sure.
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