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Old 10-10-2019, 01:04 PM   #1
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Question Van Body Running Lights Not Working

My company picked up a 2011 Freightliner with a van/cube body installed. The previous owner had the van body clearance lights wired to a toggle switch in the dash to get them to turn on and off. I have tried to tie the clearance lights into the running light wire in the rear of the truck at the right turn signal, but when you turn the lights on the van body clearance lights only come on for about 2 seconds and then shut off. The rest of the running lights stay on. Turning the running lights and/or headlights on and off give the same results over and over again. Does anyone know a wire color/location of a wire under the dash I could tie into to result in the clearance lights turning on with the head light switch?

I know our guys will not remember to flip a switch all the time and don't want them to get pulled over for this.

Thanks in advance!

Last edited by bidco225; 10-10-2019 at 02:22 PM.
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Old 10-10-2019, 01:38 PM   #2
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Default Re: Van Body Running Lights Not Working

Odd problem but it might be due to not getting enough power. Did you add a relay to the circuit? This would draw fresh power in and only use the rear tail light power as an "on" source.
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Old 10-10-2019, 01:56 PM   #3
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Default Re: Van Body Running Lights Not Working

The Body Control Module (BCM or BeCM) will see the extra load as an error and hence turn off the circuit.

If you wired the clearance lights through a relay with the signal from the tail lights and the feed from a live (either permanent or ignition controlled) then the BCM would not see the extra load and would work correctly. there may be a 'Body builders' terminal strip under the drivers seat for such use.

2004 UK Spec 313CDi (OM611 2.2 litre 4 Cylinder Manual Non-ABS)
Auto-Trail 'Cheyenne' Coachbuilt Motorhome
36,000 miles from New

Sprinter reference info site http://diysprinter.co.uk/reference/
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Old 10-10-2019, 04:12 PM   #4
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Default Re: Van Body Running Lights Not Working

I agree with Keith: you overloaded the circuit (all those extra lights looked like a short circuit to the delicate Sprinter)

These 2007 service documents may help: (pretty much unchanged to 2011)
http://www.diysprinter.co.uk/referen...nformation.pdf <-2007 MB service manual
http://www.diysprinter.co.uk/referen...nformation.pdf <- wiring diagram from above
http://www.diysprinter.co.uk/referen...inter-2500.pdf <-- 3rd party wiring diagrams

... the exterior lighting systems are "intelligent", so they require more effort to fool them.
If you always want the lights on when the engine is running, you could tap into the EK1 terminal strip under the driver's seat:

Use the "ignition on" tap (black/yellow wire), not the "D+" one.
You can verify that you have an EK1 by fetching your datacard for the options MB put in *your* Sprinter here:

2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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