Glow Plug Relays
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The symptom I noticed was that the voltage no longer dropped during the WTS light, or after startup - it would immediately jump to ~14V. That indicated that the glow plugs were not burning, even though they're new MotorCraft, with new Dorman VCGs. So I checked voltage on the GPR output and found it was nearly 0 during WTS, even though there was battery voltage across the small terminals. That meant that the relay had failed internally, so rather than replace it with a new Ford/MC relay, I bought this heavier relay on advice from
TheDieselStop. But I had to fabricate a mounting bracket for it. I might re-build the bracket later, because I think this one will crack soon. But it does fit under the original engine cover.
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![gprs.jpg Glow Plug Relays
IF THE IMAGE IS TOO SMALL, click it.
The symptom I noticed was that the voltage no longer dropped during the WTS light, or after startup - it would immediately jump to ~14V. That indicated that the glow plugs were not burning, even though they're new MotorCraft, with new Dorman VCGs. So I checked voltage on the GPR output and found it was nearly 0 during WTS, even though there was battery voltage across the small terminals. That meant that the relay had failed internally, so rather than replace it with a new Ford/MC relay, I bought this heavier relay on advice from [url=https://www.thedieselstop.com/whats-new/posts]TheDieselStop[/url]. But I had to fabricate a mounting bracket for it. I might re-build the bracket later, because I think this one will crack soon. But it does fit under the original engine cover.
GO TO THE [url=https://www.supermotors.net/registry/media/1163180]NEXT[/url] PAGE...](https://www.supermotors.net/getfile/1163177/fullsize/gprs.jpg)