Glow plug relay question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 01-28-2017, 01:18 PM Thread Starter
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Glow plug relay question

I have been suspecting my gpr is going bad because of some cranky starts lately in cooler weather. I got around to testing it and my voltage to the hot side was 12.53 (same as my batteries) and with KOEO I get 10.5 to the other side of the relay. With KO I have zero on the glow plug side.

It is a tight fit in their on these vans and I could only see one relay on the left bank. There may have been another one hidden behind the alternator down low but I don't think I have the air intake heater. I want to make sure I am testing the correct relay. There was a click when I KOEO'd it.

Can somebody please verify for me that I should in fact have 12.53 on both sides of the relay with the KOEO? If it is bad this is the 3rd one in 5 years. Could somebody also recommend a heavier duty replacement? I have heard good things about the stancor, but there are options I think.

Thank You,
Kristian

Current diesels: 97 Quigley E350 7.3, 2005 Passat TDI
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post #2 of 13 Old 01-28-2017, 01:32 PM
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I seem to remember that Corey sells a good one. @Corey@CNCFAB

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post #3 of 13 Old 01-28-2017, 02:53 PM
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Test your glow plugs at the uvch, the two outer pins are for the glow plugs.

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post #4 of 13 Old 01-28-2017, 03:07 PM Thread Starter
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Quote:
Originally Posted by greasyF250 View Post
Test your glow plugs at the uvch, the two outer pins are for the glow plugs.
Before I get to testing the glow plugs at the harness I want to make sure that my relay is working. Should I have 10.5 volts on the working side with KOEO or should I have a full 12.5 like the hot side?

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post #5 of 13 Old 01-28-2017, 03:17 PM
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You should have the same on both side of the relay.

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post #6 of 13 Old 01-28-2017, 03:26 PM Thread Starter
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Quote:
Originally Posted by partyman97_3 View Post
You should have the same on both side of the relay.
Thank you, so the relay is bad. I have seen the stancor one and then the Western plow relay (5613k-2). I can't find any ratings on the plow relay. The stancor looks like overkill but maybe that is what it takes to not replace it again! Almost $30 difference in price.

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post #7 of 13 Old 01-28-2017, 03:58 PM
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Here is the one Corey sells.

CNC Fabrication LLC, Diesel Performance, WESTERN SNOW PLOW RELAY 56131K-2
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post #8 of 13 Old 01-28-2017, 05:45 PM
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Here is some info for you on testing (its for the trucks and will work on vans too as there is no difference):

To check the glowplug relay (GPR), measure the voltage drop across the GPR's large terminals. While the GPR is active (up to 1.5 to 2 minutes after the key is turned to Wait-to-Start) put your meter leads on the large terminals (one lead on one large terminal and the other lead on the other large terminal). The measures how much voltage is being "lost" across the relay. A reading of 0.3V or more indicates a bad relay.

For checking the injector/glowplug wiring: From each valvecover gasket connection's outermost pins (2 per connector) to ground you should get 0.1 to 2 ohms (indicates good plug and wiring). From each valvecover gasket connection's center pin to each immediately adjacent pin, you should get around 3 ohms (indicates good injector solenoid and wiring). You should not get any continuity from any of the outer pins to the 3 inner pins (indicates no shorts between injector and glowplug wiring). You should also get 0 to 1 ohms from each of the external harness connectors outer pins back to the Glowplug Relay's large terminal on the GP side (indicates good wiring from external connections back to the relay).

Both the Western Plow (the Corey sells mentioned above) and the White Rodgers (formerly Stancor) 586-902 relays are good ones. I've used both and had no issues at all. They both mount a little different, but there are no problems with doing that. I'm currently running the Western Plow unit as I can get it to fit under the decorative engine cover with the shunt on my California 97 truck. Cheers!
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post #9 of 13 Old 01-28-2017, 07:11 PM Thread Starter
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Quote:
Originally Posted by Patrick Feeley View Post
Here is some info for you on testing (its for the trucks and will work on vans too as there is no difference):

To check the glowplug relay (GPR), measure the voltage drop across the GPR's large terminals. While the GPR is active (up to 1.5 to 2 minutes after the key is turned to Wait-to-Start) put your meter leads on the large terminals (one lead on one large terminal and the other lead on the other large terminal). The measures how much voltage is being "lost" across the relay. A reading of 0.3V or more indicates a bad relay.
I should go back in and test it this way to make sure. I tested each main terminal to chassis ground, not across both terminals. It's difficult to get both hands in there to hold the leads but I'll see what i can do. Thank you for the responses. If I do need a new one I'll get the plow relay.

I'll report back what reading I get tomorrow afternoon.
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post #10 of 13 Old 01-28-2017, 07:30 PM
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Just so you know, the Western plow relay has the same specs as the Stancor. 800a inrush capacity with 150a 100% duty cycle. It's actually made by Trombetta. I sell alot of them.

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