there is a glow plug controller that controls the time the glow plugs stay on. get it checked to see if it is bad. bad idea to throw any parts at it till you find the failure as these parts are very expensive.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided

Already replaced that relay and fuel filter to . Runnin anti gel in fuel to so diesel isnt gelling up

Response from covell
1 question asked

it is not a relay, it is a controller.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided

Ya think we r talkin about same thing ! It opens when key is on and sends 12 volts down to glow pluggs for about a miniute then closes . I replaced it cause it was not staying open as long as it should

Response from covell
1 question asked

Part OEM Part Price
Glow Plug Control Module
Glow Plug Module Assembly FOTZ12B533A $184.92

REMOVAL

Disconnect the batteries.
Remove the plastic terminal cover from the relay.

CAUTION : Do not use a screwdriver or similar tool to pry off the terminal cover. Battery voltage is present at the terminals.

Disconnect the battery terminal connector (12 volt power wire), the glow plug relay connector, and the harness connector.
Remove the mounting screws and remove the relay from the engine.

INSTALLATION

Install the relay on the engine and tighten the screws.
Reconnect the harness connector, relay connector, and the battery terminal connector.
Reinstall the plastic terminal cover.
Reconnect the batteries.

the second is the relay that i believe you replaced. the first is a small computer.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided

Ford p # i replaced is f8z-12b533-ac were is other controler located cant find it on my scematic and how do i test it ?

Response from covell
1 question asked

that is only the solenoid.

you need a scan tool to check it. i have never been able to bench test this unit off vehicle.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided