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Discussion Starter · #1 ·
Just bought this truck and the headlights wont dim. Tried swapping out the fuse box relays. Disconnected the blinker dimmer switch. Still stay on. One schematic I have shows a MFTS but if there is one I cant find it. This is a early 2000 model I think. Any help would be helpful.
 

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Check your 7 way plug that plugs into the trailer for a short, my 2000 379 did the same thing and after changing out the turn signal switch and tracing the entire headlight circuit to no avail I took the plug apart on the trailer light cord and found a short; rewired the plug and everything worked correctly again.
 
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