Glow plug relay
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Freshman User
Joined: Aug 2001
Posts: 40
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From: New Mexico
Glow plug relay
I have a late model 99 PSD. My gpr relay was bad(took it of and checked it). The parts house sold me a GPR7 Borg Warner relay. It doesn't work on the truck. Power in on the coil side and the power side but it won't engage. took it of and had it tested and it worked fine. Does antbody have any idea why the relay won't engage when on the truck? Thanks to all for all the great info,
B
B
Postmaster
Joined: Nov 2003
Posts: 3,595
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From: Utah County, UT
Shouldn't make any difference, but from what I find the GPR7 B W relay is for the 88-91 Diesels. Think the only difference is where the mounting tabs are, did you check to see if you are getting 12V to turn the relay ON, i.e. measure across the two samller post?
Posting Guru
Joined: Nov 2000
Posts: 1,005
Likes: 1
From: Cincinnati, Ohio
With key off you should have battery voltage to one large terminal and nothing to the other large or either of the small terminals.
With key on for the first two minutes or so you should have battery voltage to both large and one small terminal. The other small terminal should show ground. This shows the relay active.
With the key on and after the glow plug cycle has finished you should have battery voltage to one large and both small terminals. The computer activates the relay by grounding the second small terminal thus activating the relay.
It is possible to have battery voltage to both large terminals when the relay is active and still have a bad relay. If the contacts inside are pitted or corroded you may have low amp voltage passing through it but not enough power to actually run the glow plugs.
Hope this helps out.
Dave / Believer45
With key on for the first two minutes or so you should have battery voltage to both large and one small terminal. The other small terminal should show ground. This shows the relay active.
With the key on and after the glow plug cycle has finished you should have battery voltage to one large and both small terminals. The computer activates the relay by grounding the second small terminal thus activating the relay.
It is possible to have battery voltage to both large terminals when the relay is active and still have a bad relay. If the contacts inside are pitted or corroded you may have low amp voltage passing through it but not enough power to actually run the glow plugs.
Hope this helps out.
Dave / Believer45
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