I had the same issue experienced in this old thread:
Step Alarm Fuse
It's a failure in the "Run Only Power Source" circuit.
These were my symptoms:
. Step alarm 5A fuse immediately blows on ignition key turn, step operation good.
. 18 ohms to ground on the load side of the step alarm fuse with ignition off - not good.
. Jacks beeper and alarm light dead, jack control panel and operation good.
. Rearview camera dead (inline fuse good, temporarily rewired to house power, then good.)
. Coach heater blower motor dead.
. Alternator does not charge house bank - no bueno when I have 1,300 miles to drive starting the next day. Temporarily rigged an aux battery/inverter to keep house bank charged while traveling.
. Battery boost operation good.
I started going through the remaining circuits mentioned upthread:
. Coach heater switch removed, does not resolve short.
. Battery boost switch removed, bingo, short resolved.
Before I go hunting for it, can anyone tell me what that solenoid looks like, and/or where it is located? I plan on replacing the switch with something generic and the solenoid with the NAPA equivalent mentioned in the old thread.
Cheers,
Steffan
2003 Adventurer 33V
Threaded Mode
