Glow Plug Relay
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Senior User
Joined: Apr 2005
Posts: 159
Likes: 0
From: Inland Empire, So Cal
Glow Plug Relay
From everything I have read here if my truck is a hard start on cold mornings and I have replaced the glow plugs the next thing to look at would be the relay right?
Laughing Gas
Joined: Apr 2002
Posts: 1,007
Likes: 1
From: Newport News
Either the relay or the harness that connects to the plugs. If you've replaced all the plugs and it still is having trouble, it is probably the relay. If you replace the relay and still have problems, break out a multimeter and check the harness.
Posting Guru
Joined: Nov 2000
Posts: 1,005
Likes: 1
From: Cincinnati, Ohio
If you want to test the relay when the truck and weather are both cold enough to require the glow plugs take a single jumper cable and jump across the two large posts on the relay for 90 seconds, disconnect and try starting. If the truck starts fine then the relay or what controls it is the issue.
Dave / Believer45
Dave / Believer45
