You would have to be more specific. Which relay are you looking for? Most relays are mounted under the hood along the firewall.
On mine, it is located behind the passenger side headlight. You need to pull the headlight out to get to it.
In a 2006 Ford E-350 : In the Power Distribution Box ( which is " live " ) located in the engine compartment : ( Relay " A " is the fuel pump relay , it is next to fuses # 21 and # 22 )
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It won't have a relay. Usually it is the switch, or the fan motor that goes bad.
In the engine compartment there is a box (power distribution box)that has several fuses and relays in it. My owners guide says that it should be relay #3, but check the inside of the top to see if that is correct.
The starter is on the side of the engine at the bottom.
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Under the dash board on the left side of the steering column.
You need to replace your Blower relay,
The fuel pump relay for the 1986 Class C RV with the 460 gas engine (7.5L) is located inside the engine compartment above the driver side head light. The inertia switch is by the passengers right foot behind the panelling. Thehere is also an oil pressure switch that will kill power to the fuel pumps if there is no oil pressure. This switch is on top of the engine on the aft section of the engine. If you don't find the relay on the driver side, look behind the passenger side headlight. That is where it is located on my 86 e350. You have to pull the headlight out to get to it.
on the firewall next to the battery