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marker and tail lights

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Old Jan 13, 2014 | 11:42 AM
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f550 service truck
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Cool marker and tail lights

I have an 04 f550 service truck. I stripped it down and repainted it removed all the lights and put them back in. Now I have no tail or marker lights when put lights in all worked hit turn signal and tails flashed figured it was a ground so added a ground wire. Now have no tail or markers I have head, cab, mirror, and brake, and turn signal no front markers or any on bed any suggestions greatly appreciated. Could I have blown internal relay in fuse box. thanks new member great site.
 
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Old Jan 15, 2014 | 04:30 PM
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f550 service truck
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I fixed this one. I tested all the way back to switch with a power probe it showed ground all the way to the switch. I started back feeding wires and could hear a faint click in fuse box. I did some research and ford put an internal non replaceable relay in it. would suggest finding on ebay or salvage yard as new is expensive. 425.00 through dealer. I installed fuse box and all work great internal relay was weak and wouldn't send power out.
 
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