I have an 04 305 555 and I am trying to locate a part placement.
Probably around the drivers side battery or left side of engine.
Looks like a relay...if anybody has some detailed pics , I would appreciate it.
I have an earlier post with part number?
Thanx all...Ted

 

Maybe you could post a pic of yours so we can identify it....

 

I don't know how to post pics...
The wire leads up from the left frame rail enclosed in factory loom.
I suspect it might have had something to do with the original lift pump that was replace by the factory in tank unit.
I have had this truck since new with no mods other than the lift pump replacement.
I will try to find out how to post a pic...thanx for your patience.