Keith Browning Posted April 14, 2006 Share Posted April 14, 2006 This is a strange one! A 2004 F350 comes in with the red brake warning lamp on. Follow the diagnostics in the service manual and find NO fault. Remove the wire/pin for the p-brake switch from the cluster, the light goes out. Reran all tests in the manual. No problem found. Checked a 2003 wiring diagram. Same. /forums/images/%%GRAEMLIN_URL%%/banghead.gif For some reason, the Daytime Running Lamp power circuit is spliced into the brake warning lamp circuit. There is no mention of this in the Workshop manual or the wiring diagram. I had the tech check all fuses and grounds before we were to call the HotLine. Found F2.27 open. Replaced fuse, DRL is working and has not blown the fuse again. /forums/images/%%GRAEMLIN_URL%%/shrug.gif Quote Link to comment Share on other sites More sharing options...
gasgasman Posted April 15, 2006 Share Posted April 15, 2006 It shows that circuit in the 2004 EVTM. Cell 97-1. There's a parking brake relay that feeds off that fuse F2.27. California Diesel pickups and CA gas Excursions. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted April 15, 2006 Author Share Posted April 15, 2006 Yeah, we picked that up after the fact. I feel bad for the guy wasting all that time. It reinforces looking at all of the details like SPLICES! I understand that the DRL will turn off the lights with the parking brake applied as a feature of the DRL. I just don't understand why the manual doesn't have the technician check the DRL while diagnosing the P-Brake warning indicator. I have no problem with one system affecting another but let's be more thorough with the diagnostics. Anyway, this is a good "heads-up" worth mentioning. Quote Link to comment Share on other sites More sharing options...
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