By Pass GPR

[cbwells]

I see post on how to do it to a 86 or 88 how about a 90 mine has the white and looks like a green might be blue on the same post that's the way it was when I got the truck

 

[franklin2]

Here's what yours should look like at the rear of the engine(you might have to take a cover off).

Just take the white wire off and tape it. Hook a new wire to where the white wire used to be, run it into the cab, and hook it to a momentary pushbutton. Hook the other side of the pushbutton to a good ground. This will manually activate the glowplug relay, and take the glowplug "brain" out of the circuit.

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[cbwells]

Thank You Very Much

 

[cbwells]

Thanks I did that and it works fine

 

[rhkcommander]

the box is the controller, that is what you are bypassing. the round cylinder with four studs on top is the GPR glowplug relay