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FLDirector's avatar
FLDirector
Explorer
Mar 01, 2020

1999 Ford F53 Motorhome Chassis Fuse Issue

I apologize if this question has appeared elsewhere.

The start of this problem was with the Kwikee step fuse blowing. I checked all of the fuses on the Intellitec fuse panel under the step, changed the bottom fuse and it worked.

I turned on the radio & it worked. Turned it off then back on and nothing.
I started checking connections under the dash. The reading was 0 volts on the accessory wire and ground, then 0 volts on the battery wire and ground.

I traced the line to the Body Build wire bundle.

Next I checked the fuses in both the Distribution Fuse Box and the under dash fuse panel.
On the Distr.Panel all maxi and standard fuses and the upper row of mini fuses read the battery voltage, but the lower row were all “0”.
The under dash panel had all fuses read “0”.

The last section of fuses I found was under the step in the battery compartment. The fuse that blew on the step circuit was the bottom fuse. The next two moving upwards read “0”, while the rest read 12 volts. Yet all were visually inspected and passed.

It would appear that I have either a partial ground, a feed wire from the battery to the fuses or... I’m at my wits end.

Any ideas?
  • Some of those fuse will come thru a relay controlled by the ignition,
    And will only have voltage when the engine is running
    The ignition will be the control signal
    And the power could come from either chassis battery or house batteries depending on the circuits to be powered
  • Steps, awnings, jacks, slides may not work unless motor is off or trans in not in park or em break is not set. Some require the ignition to be in ACC mode. It all depends on the manufacturer. It's a safety issue. You don't want those this activated while driving.
  • That makes perfect sense. However, shouldn’t a line that should be “always hot” only be separated from the positive of the battery by a fuse, independent of the position of the ignition?
  • FLDirector wrote:
    That makes perfect sense. However, shouldn’t a line that should be “always hot” only be separated from the positive of the battery by a fuse, independent of the position of the ignition?


    Any line should be protected from a fuse. You would not and always hot line to any of those pieces of equipment.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Some lines in a motor home may be.. Battery--fuse or breaker--cut off solenoid---Stuff.