What is this? ‘80 C20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

44SAA · 03-07-2022, 10:29 AM

Howdy- can you fellas put eyes on this and help me ID please? It’s driver side located in front of cruise. It’s grounded and not mounted to anything, just flopping around. Thank y’all

**kwmech** · 03-07-2022, 12:23 PM

Looks like an AC relay. but it's in the wrong spot. find out where the red wires go. Obviously one will go to battery the other???

**mongocanfly** · 03-07-2022, 12:34 PM

Does look like it..
https://www.classicindustries.com/product/d158168.html
Might unplug it and see if theres any numbers stamped into it

44SAA · 03-07-2022, 12:43 PM

Yeah- looks identical to my AC relay. Here is what it connects to. Thank you fellas. Old boy had a CB hooked up, maybe that’s what it was for

44SAA · 03-07-2022, 12:47 PM

Yeah Mongo- same part. However, my AC and blower relay on pass side are all squared away and working.I think it may have something to do with emissions canisters I removed as they were in the same area

sick472 · 03-07-2022, 03:33 PM

Horn Relay...Maybe??? Easy enough to test for that.

Dead Parrot · 03-07-2022, 04:52 PM

Possible a PO salvaged that relay from a different vehicle and used it for some gizmo in the truck.

Pull the connector loose and see what, if anything, quits working.

Possible the gizmo was pulled from the truck before it was sold.

**Wgesnerjr** · 03-07-2022, 05:49 PM

I saw this on a C20 Camper Special we once had. I think it was for the dual battery set up for the camper. I think the relay isolated the battery when the truck was off and charged it when the truck was running. Ours was pretty FUBARed when we got so not 100% sure on its true functionality from the factory. Just my guess.

44SAA · 03-07-2022, 06:27 PM

Thanks Jay- I have a trailering special and PO removed battery tray. You may be onto something

**temp190** · 03-07-2022, 08:23 PM

Is this it?

44SAA · 03-07-2022, 08:55 PM

Thanks fellas- couldn’t have figured it out myself. Here is a pic including my sidekick fishing partner/assistant wrench turner

**Corts60** · 03-07-2022, 09:12 PM

That’s also the same relay GM used for the glow plugs on the early diesels. 78-80 they mounted two of them on the driver side fender. One relay for each bank of glow plugs.

LT7A · 03-09-2022, 06:35 PM

Nice looking truck. And boots, shorts, and shades - your sidekick is ready for anything.

03-07-2022, 10:29 AM	#1
44SAA Registered User Join Date: Apr 2017 Location: Fort Worth Posts: 111	What is this? ‘80 C20 Howdy- can you fellas put eyes on this and help me ID please? It’s driver side located in front of cruise. It’s grounded and not mounted to anything, just flopping around. Thank y’all Attached Images Last edited by 44SAA; 03-07-2022 at 10:30 AM. Reason: More info

03-07-2022, 12:23 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,635	Re: What is this? ‘80 C20 Looks like an AC relay. but it's in the wrong spot. find out where the red wires go. Obviously one will go to battery the other???

03-07-2022, 12:34 PM	#3
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: What is this? ‘80 C20 Does look like it.. https://www.classicindustries.com/product/d158168.html Might unplug it and see if theres any numbers stamped into it __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

03-07-2022, 12:43 PM	#4
44SAA Registered User Join Date: Apr 2017 Location: Fort Worth Posts: 111	Re: What is this? ‘80 C20 Yeah- looks identical to my AC relay. Here is what it connects to. Thank you fellas. Old boy had a CB hooked up, maybe that’s what it was for Attached Images

03-07-2022, 12:47 PM	#5
44SAA Registered User Join Date: Apr 2017 Location: Fort Worth Posts: 111	Re: What is this? ‘80 C20 Yeah Mongo- same part. However, my AC and blower relay on pass side are all squared away and working.I think it may have something to do with emissions canisters I removed as they were in the same area Last edited by 44SAA; 03-07-2022 at 01:01 PM.

03-07-2022, 03:33 PM	#6
sick472 Registered User Join Date: Jul 2015 Location: Sedalia Mo. Posts: 1,131	Re: What is this? ‘80 C20 Horn Relay...Maybe??? Easy enough to test for that. __________________ He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20

03-07-2022, 04:52 PM	#7
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,611	Re: What is this? ‘80 C20 Possible a PO salvaged that relay from a different vehicle and used it for some gizmo in the truck. Pull the connector loose and see what, if anything, quits working. Possible the gizmo was pulled from the truck before it was sold.

03-07-2022, 05:49 PM	#8
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: What is this? ‘80 C20 I saw this on a C20 Camper Special we once had. I think it was for the dual battery set up for the camper. I think the relay isolated the battery when the truck was off and charged it when the truck was running. Ours was pretty FUBARed when we got so not 100% sure on its true functionality from the factory. Just my guess. __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

03-07-2022, 06:27 PM	#9
44SAA Registered User Join Date: Apr 2017 Location: Fort Worth Posts: 111	Re: What is this? ‘80 C20 Thanks Jay- I have a trailering special and PO removed battery tray. You may be onto something

03-07-2022, 08:23 PM	#10
temp190 Junior Member Join Date: Mar 2021 Location: Oronogo, mo Posts: 35	Re: What is this? ‘80 C20 Is this it? Attached Images

03-07-2022, 08:55 PM	#11
44SAA Registered User Join Date: Apr 2017 Location: Fort Worth Posts: 111	Re: What is this? ‘80 C20 Thanks fellas- couldn’t have figured it out myself. Here is a pic including my sidekick fishing partner/assistant wrench turner Attached Images Last edited by 44SAA; 03-10-2022 at 09:01 AM.

03-07-2022, 09:12 PM	#12
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: What is this? ‘80 C20 That’s also the same relay GM used for the glow plugs on the early diesels. 78-80 they mounted two of them on the driver side fender. One relay for each bank of glow plugs. __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

03-09-2022, 06:35 PM	#13
LT7A Registered User Join Date: Oct 2015 Location: PNW Posts: 3,627	Re: What is this? ‘80 C20 Nice looking truck. And boots, shorts, and shades - your sidekick is ready for anything.



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