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Old 04-21-2010, 07:29 PM   #1
Senior Member
Workhorse Chassis Owner
Join Date: Jul 2006
Posts: 298
More info on blown fuse

Last year in March I had a problem with the ILLUM 10A fuse blowing.
According to the fuse diagram, the IILUM fuse was for the instrument cluster lights. I took my MH to a Workhorse service center. They replaced the intstrument cluster. That solved my problem with the ILLUM fuse. In June, I had the fuse labled STEP ALARM 10A blow. When the fuse blew, my steps were not working, power mirrror not working, rear monitor and jack alarm was not working. After replacing this 10A fuse, all above parts began to work. Last week fuse blew again, with same result of the above not working. After I replace the fuse all is working again. Again blown fuse. I can turn off rear veiw camera, steps not moving, not using power mirror. The fuse is blowing when I turn on my running lights with all the above off. I notice when the running lights are off, the lights above each dash switch (not cluster) are on, should this be just the opposite- the dash lights should come on when turning on running lights? Running lights, turn signal, brake lights and intrument cluster lights work fine with blown fuse. To summerize, when I turn on my running lights, the STEP ALARM fuse blows, the dash switch lights go off, the power mirror, rear monitor, steps, and power mirror does not work.
Could the new intrument cluster be causing this? Could all this be tied to the one fuse?

2015 Flagstaff Super V Trailer
Model 26VFKS
Towing with F150 Crew cab 5.0L
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Old 04-21-2010, 08:45 PM   #2
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Nor'easters Club
Workhorse Chassis Owner
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Posts: 29,008
With all you have on that 10 amp fuse maybe you need to change some feeds to your options.
Heres a couple of links to increase amp feeds and maybe save your ignition switch.


98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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Old 04-22-2010, 02:16 PM   #3
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Workhorse Chassis Owner
Join Date: Jul 2006
Posts: 298
I moved wires around but could not find any wire chafing. The problem went away and everything is working fine. But it must be a chafed wire.
I placed some thin rubber under wires where they could have rubbed against any metal causing a hot wire to hit ground. Maybe this will help unless it is 2 wires rubbing together. Thanks ...............
2015 Flagstaff Super V Trailer
Model 26VFKS
Towing with F150 Crew cab 5.0L
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