Ford 7.3L Powerstroke Relay

Premium Glow Plugs

7.3L Powerstroke Glow Plug Relay

- Improved design for longer life! -

Made in the USA


Solve a very common problem with the Powerstroke diesel - if you are getting very hard starting this could be your problem. To test your relay, connect your test light across the two little terminals and activate the glow plugs by turning on the ignition. If your test light comes on, the signal to the relay is good. Now connect your test light's clip to engine ground. With the ignition off again, touch each of the big terminals on the relay. One will cause the test light to light - this terminal is connected to battery positive. Now, cycle the glow plugs on again. The opposite big terminal should now be getting power. If not, the relay is bad. NOTE: Mid 1999 and newer trucks will appear to have two glow plug relays, but the one toward the front is for the intake air heater. The one toward the rear of the truck is the glow plug relay.

Note: This relay is the replacement for all years of Powerstroke trucks. A few trucks will have only one small terminal instead of two. If you happen to run into this, just run a small wire from the unused little terminal to ground - one of the relay mount bolts works fine. If you need any help with this, let us know. Some 1994.5 - 1995 trucks will use a molded plug instead of bolt on connection. This relay is also the correct replacement for these applications but will require that the molded plug be removed and replaced with standard eyelet terminals.

Note: This part will not fit 2000 and newer trucks with California emissions. These trucks require a glow plug control module which has the ability to monitor the glow plugs for emissions purposes.


We also carry glow plugs, valve cover gaskets, UVC harnesses, repair terminals, and complete glow plug kits for your 7.3L engine.

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$34.95

Code: HDC908
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