I have a Damon RV in the shop built on on the F53 chassis.
The complaint is that the cranking battery will go dead with
a short period of non-use. The last shop ( a wanna be RV
shop) pulled fuse #4 (courtesy lamp relay) and told the
customer to not replace it. Inserting the fuse will cause
the courtesy lamp relay to turn on (KOEO, key in my pocket).
I am unable to find any wiring diagrams on this vehicle BUT
the NHTSA shows a Ford TSB as follows:
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1999 Ford F53 6.8L