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06-10-2014, 12:38 AM
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#1 |
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Senior Member
 
Join Date: Mar 2014
Location: Toano, VA
Posts: 828
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What Is This? (Engine bay, 1970 C10.)
Me and my father are working on a 70 C10 currently and are nowhere near wiring pros, we learn as we go. But this has us stumped.
It's right on the firewall (square looking thing with prongs). We believe the engine is an early-mid 80s model (alternator on other side, choke on other sode, ect). This truck has factory AC, and factory power steering. (If that helps) Thanks in advance. Hope you guys can help. BTW: pic is sideways, flip clockwise to have actual in person view. (New to posting pics)
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 Last edited by KyleSeal; 06-10-2014 at 12:39 AM. Reason: Fix pic. |
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06-10-2014, 05:22 AM
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#2 |
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Registered User
Join Date: Sep 2013
Location: Sassafras. Victoria. The beautiful Mount Dandenong Ranges
Posts: 234
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Re: What Is This? (Engine bay, 1970 C10.)
Can you take a clearer pic using a flash? Its hard to see what we're lookin for.
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CLASSIC 1970 C20 WITH A RUMBLIN' V8. IT'S MY MID-LIFE CRISIS ONLY IT AIN'T A LITTLE RED SPORTS CAR OR A HARLEY! IF YOU'RE GUNNA SKATE ON THIN ICE, YOU MAY AS WELL TAP DANCE! |
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06-10-2014, 07:18 AM
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#3 | |
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Senior Member
Join Date: Mar 2014
Location: Toano, VA
Posts: 828
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Re: What Is This? (Engine bay, 1970 C10.)
Quote:
__________________
"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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06-11-2014, 01:14 AM
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#4 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: What Is This? (Engine bay, 1970 C10.)
At first I thought it was a relay for the TCS system ( transmission controlled spark) but that didn't start until 1971 I believe. It also looks like the AC fan relay. Does the AC work in the truck?
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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06-11-2014, 09:56 AM
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#5 | |
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Senior Member
Join Date: Mar 2014
Location: Toano, VA
Posts: 828
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Re: What Is This? (Engine bay, 1970 C10.)
Quote:
__________________
"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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06-11-2014, 11:52 AM
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#6 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,382
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Re: What Is This? (Engine bay, 1970 C10.)
High speed windshield pressure sensor relay.?
(sorry that's all I got) |
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06-23-2014, 02:23 PM
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#7 |
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Registered User
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: What Is This? (Engine bay, 1970 C10.)
It appears to be a horn relay....not 100% sure but that is what it looks like. It has been added to that (non-original) position under the hood for some reason.
Check up under your dash above your main fuse panel to see if the original one is still there. Does your horn work? Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 Last edited by Coley; 06-23-2014 at 04:31 PM. |
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06-23-2014, 07:35 PM
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#8 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,216
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Re: What Is This? (Engine bay, 1970 C10.)
I had one there on my 71 it wasnt hooked up and wasint in the new harness if i went with out it
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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06-24-2014, 08:34 AM
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#9 |
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Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,448
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Re: What Is This? (Engine bay, 1970 C10.)
My 1970 Blazer has this. It has no A/C, possibly relay for high idle solenoid?
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07-14-2016, 10:52 AM
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#10 |
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Active Member
Join Date: Jun 2016
Location: Salida, CA
Posts: 177
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Re: What Is This? (Engine bay, 1970 C10.)
Came across this old thread while looking at wiring pictures. I have that thing on my firewall too. And it had me stumped too According to the 1970 factory service manual, it's the relay for the transmission controlled spark system. Mine actually had wires attached and running down to the trans area, although it wasn't plugged in. My truck has factory air too and I had thought it might be something for it, but the manual is pretty clear. Cheers!
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