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Power Strokes
7.3 Tech
#18 fuse is blowing when I hit the brakes....no brake lights.
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[QUOTE="cranstol, post: 1545928, member: 31632"] [b]My fuse#18 issue[/b] Thank you all above for the input and things you found. I thought it would be appropriate to share my experience tracking this down on my 2003 Excursion. Every single time I touched the brakes... *POW*, #18 blew. Started looking for obvious stuff, but nothing. Disconnected trailer plug etc. via the connector behind the license plate. Tested *POW* Moved up to the mid-frame area on the drivers side. Disconnected the back end lights from there. *POW* Good thing I have a 20 pack of 20 AMP fuses. Disconnected those same cables from under the hood right in front of the firewall. *POW* Disconnected the brake switch. Did not blow, but no brake lights of course. Manually jumped pin 4 and 5 of the brake switch connector. Found a schematic online and those are the contacts bridged by the switch on the 20 amp circuit. *POW* on the manual jumper. Something elsewhere... Pulled all the relays, etc from the two block areas under the hood just in front of the driver. *POW* The issue is getting in a smaller and smaller area. Pulled the entire fuse block / power distribution block lose under the dash. 4 bolts 10mm heads. Got a good look behind. Saw nothing. Ready to give up. Tried one last fuse (still have 10 or so left)... maybe it was MY last fuse. :-) Tried the brake, no blow! What?!? Added relays, etc. back. Tested. *No blow* Added connectors under hood. *No blow* Added mid frame connectors. *No blow* Added connector behind license plate *No blow* Mounted fuse block / PDB *No blow* Everything is back together and working. Driven 150+ miles since and it is still working. Not the outcome I exactly wanted as I wonder when (not if) it will pop up again. Hopefully the extra details of the things I did will help someone else down the line with diagnostics. 2003 Excursion 6.0L Limited 2000 Excursion 7.3L Limited 1971 Suburban dead 350 :-( [/QUOTE]
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#18 fuse is blowing when I hit the brakes....no brake lights.
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