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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6173
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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I have a 95 F250 7.3L turbo diesel. The new glow plug relay

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I have a 95 F250 7.3L turbo diesel. The new glow plug relay has 4 wire terminals and the old one has only three. How do I hook up the new one?

Hello and thanks for using Just Answer.I will try my best to help you with your question.


What are the wire colors to the old one?

Can you list them?


Customer: replied 6 years ago.
one skinny red wire has a rubber harness that slides over a small threaded terminal. there are two big threaded terminals with nuts, one has a red wire and the remaining wires are on the other terminal. The new relay has a red wire harness hooked to two small threaded terminals this does not match the old harness. this leaves two big threaded terminals, the problem is the small terminals how do i hook up the small red wire?

Below is a picture of the glow plug relay. There is a small red wire with light green stripe.


Here is the wiring diagram.



I'm doing a little more digging. Does the picture help?

Customer: replied 6 years ago.
you answered my question, thank you
Your welcome. Let me know if you need any more help.
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