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My flasher relay ( flasher if you will) is located in tne fuse panel on the front looking out at you. It is round.
it is under the dash, nearly uner the radio in a black box
under conductor seat on the frame
Behind center of instrument panel.
1990 f350 did not have a turbo, unless it was fitted after market, so check what engine you have such as year and size and then maybe we can answer your question
On top of the engine
How do you change the alternator on a 1996 ford F350 diesel
The fuel pump relay allows the pump to be turned on and off. In a 1994 Ford F350 4X4 5.8L, the fuel pump relay is located under the hood and inside the fuse box.
where does the oil pressure regulator on a ford f350 diesel truck
under the hood on top of the drivers side tire in the fuse box.
Front seating area, driver side, under dash, mounted in fuse panel.
mounted to the firewall behind the radio