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Old 09-01-2010, 03:51 PM   #1 (permalink)
dan3103
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Replacing glow plug relay

First post, I'm glad to have found you!

I have a 2002 LB7 Fed Silverado with the dreaded P0380 code setting off my SES light. After reading the multitude of posts regarding this issue, I decided to go with a Ford part in my Chevy <shudder!> simply because of the HUGE cost difference between the Chevy relay and an aftermarket Ford part (NAPA). I took a few pictures of disassembling the control module, thought maybe someone else may benefit.

THANKS again for all the wisdom found here, it saved me $200 bucks in parts!

Ok, here's how I did it...

First, with the controller on the bench and the cover off...

Replacing glow plug relay-c2.jpg


push a thin screwdriver between the controller and the housing. Then using another screwdriver, gently pry the controller with the relay attached off the housing.


Replacing glow plug relay-c3.jpg

Replacing glow plug relay-c4.jpg


That allows access to remove the relay from the controller

Replacing glow plug relay-c5.jpg

Replacing glow plug relay-c6.jpg
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Old 09-01-2010, 03:57 PM   #2 (permalink)
dan3103
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continued

Here's the Chevy part vs. the Ford part. Chevy part is $116 at Autozone, the Ford part was $19 at NAPA. As you can see, the Ford part has shorter contacts on the relay than the Chevy, but it will still make good contact.

Replacing glow plug relay-i1.jpg

Replacing glow plug relay-i2.jpg

Slide the controller back onto the housing with the new relay. The NAPA (Ford) relay is not a perfect match, there is a plastic piece on the back of the relay that will not allow the relay to slide completely into the control box. I chose not to cut the plastic part off, opting to leave a bit of space, which will allow the relay to be replaced with ease the next time it fails. It's a very tight fit to push the controller back into the housing, I doubt it will slide out!

Replacing glow plug relay-i3.jpg

Replacing glow plug relay-i4.jpg

Snap the cover back on the housing, and reinstall in the truck. Pretty simple!

Last edited by dan3103; 09-01-2010 at 03:57 PM.
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Old 09-01-2010, 04:01 PM   #3 (permalink)
dan3103
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Testing the old relay

Someone else had enquired about testing the relay, here is what I did.

I hooked a 12 volt source (from a battery) to the small spade terminals on the relay. As I touched the positive contact to the relay, you could hear the "click" inside the relay, telling me that part was working.

Replacing glow plug relay-test1.jpg

I then used my multimeter to check for voltage on the larger terminals, and had 0.000. That tells me it's not working.

Replacing glow plug relay-test2.jpg

Thanks again for the valuable lessons I have learned in my short stay here!
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Old 09-02-2010, 01:24 AM   #4 (permalink)
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That's odd that your FORD relay had shorter terminals as the one I bought that has a FORD part number on it has the longer terminals on it(also my FORD relay is grey in color). Or it could just be that your NAPA relay is actually the 40 amp relay and not the 70 amp relay. A 40 amp relay is just like a 30 amp except it has the wider terminals on the 2, and a 70 amp has the longer and wider terminals. The GM relay is actually a special purpose built relay that has a 100 amp rating on it, but it has a smaller set of contacts inside than the 70 amp FORD relay has. The FORD number for the 70 amp relay is F8OZ-14N089-AA, this is different from the number on the relay but is there part number for it.
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Old 09-02-2010, 01:49 AM   #5 (permalink)
dan3103
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What was the price on the Ford part? I figure the NAPA part is not as robust as the stock part, but for the price difference, and now knowing how easy it is to change, I'll just buy an extra one and toss it in the console. It will be interesting to see how long the NAPA part lasts. Thanks for the Ford part numbers, I'm finding that when you start thinking outside the box, most parts counter people are pretty clueless.
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Old 09-02-2010, 10:50 AM   #6 (permalink)
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thanks for the numbers!!!
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Old 09-02-2010, 02:00 PM   #7 (permalink)
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I believe the FORD part is $30, but I bought the genuine FORD relay through CARQUEST under there part number 56-2335 for $14.
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Old 09-08-2010, 10:38 PM   #8 (permalink)
dan3103
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Thanks for the info and the part number!
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Old 01-20-2011, 07:47 PM   #9 (permalink)
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Great write up with excellent info! Much appreciated. Just saved me an expensive trip to the shop. 180,000 miles going strong
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Old 02-04-2011, 09:53 PM   #10 (permalink)
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I'm getting ready to do this. If the Chevy relay is 100 Amps, I don't think the 30 Amp will last very long. Can't seem to find the NAPA 70 amp relay on the web.

Any updates on how long the fixes work (30 Amp vs 70 Amp)?
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