In checking out my "new" ML, I noticed there is a spot in the fuse/realy box for a trailer light relay, but no relay.
So, if a harness is hooked up, stock, or otherwise, does a relay need to be installed?

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport