Glow plug/relay prob :( - Ford Powerstroke Diesel Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 2 Old 01-04-2013, 10:28 PM Thread Starter
Compression Ignition Addict
slammed83mazda's Avatar
Join Date: Mar 2011
Location: Shepherdsville,KY
Posts: 167
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Glow plug/relay prob :(

My glow plug relay has always worked and would start on the coldest days, before you could hear the relay click on and hummm. Well about 3 days ago I decided to play in the mud and I'm guessing I shorted something. Now the truck won't start unless its plugged in at night. Replaced the relay and still same problem.

Can someone run this down for me real quick on what to check? Maybe I missed a fuse or a relay in the box?

1 Posts gets 12V and the other gets nothing with the key on.

Any help, thanks guys.

97 F350 5 Speed CCLB TOW PIG
3.5" DP - 4" straight pipe
TS 6 Position - Diesel Innovations Tunes
6637 Filter
16" MT Classic 2, 33" Terra grapplers
83 Mazda B2000 Toy
Bagged,Shaved,Backhalfed,Cantilever, etc....To much damn $$$
slammed83mazda is offline  
Sponsored Links
post #2 of 2 Old 01-04-2013, 10:35 PM
Compression Ignition Addict
Zander's 5.8's Avatar
Join Date: Apr 2009
Posts: 205
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
The PCM grounds one of the small posts when the GP's are commanded on, the other small post is battery voltage. If it's not grounding one of the small posts trace the wiring back to the computer to make sure it's ok. Or find out what pin it is on the computer and test for continuity on that wire. If there is no ground signal from the PCM it's bad. One of the large posts should have constant battery voltage and obviously the other post gets battery voltage when the GP's are commanded on.

03 F-250 7.3L, Sport, 4x4, Auto
Zander's 5.8 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome