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Old 06-24-2009, 01:35 PM
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Fuse keeps blowing

F250 Powerstroke 7.3L
3 months ago, I changed out the GPR because it was bad. I installed a NAPA GPR-109 and didn't have any more problems for a month. Then the PCM Power fuse #25 kept blowing. I unplugged the fuel heater since this is usually the problem. That seemed to work for another month. However, this week the fuse has blown 5 times. Either the truck will not start, or it will start and shut down within 10 seconds. The wait to start light comes on and goes off as designed. The OBD will not read the Code while the fuse is blown. After replacing the fuse, I do not get any codes. Any suggestions before I start looking at all the wiring? If I need to check all the wiring, where should I start?
Thanks,
John
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Old 06-24-2009, 01:39 PM
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Is the truck hooked to a trailer when the fuse blows?That happened to me.
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Old 06-24-2009, 01:52 PM
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No, it has not been hooked to a trailer when it blows.
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Old 06-28-2009, 02:40 PM
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Sounds like you may have a loose wire on the install.... Recheck all your wires and where they are run, a loose or frayed wire will play hell on our trucks. Keep us up to date.
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Old 06-29-2009, 08:29 AM
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I think I found it. The wiring diagrams I have do not show fuse #25. So I pull the fuse box and traced the wire. It went directly to the PCM Relay. Looking at my diagrams, it showed a red wire from the PCM Relay to my brake switch. So I started there and traced it back to the 7 pin trailer connection. The center pin wire was broken off it's connection and it looked like it rubbed through one of the other of the six wires. I repaired the wires and connections, changed the fuse, and haven't had any problems with it so far.
Thanks.
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