1999 ford f350 super duty diesel - when truck sits for a few days, the dome light comes on very dim and then the horn will blow randomly and stay on until the dome light switch is turned to "ON." to me it seems to be some sort of a backfeed or a ground issue. any suggestions?
I think you are right.Find the short and repair it or you can try to take the bulb out of the dome light and keep the switch on and see if that helps but you won't have a dome light.
Is the battery fully charged.
Sounds like you have a short in or near the fuse block. Best taken to a good mechanic to have it checked.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
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