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#1 |
Registered User
Join Date: Jul 2014
Location: Hanna, Alberta
Posts: 30
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Under Dash Relay??
Hi all,
I have recently begun stripping the interior of my 1972 C10 and came across this relay under the dash above the fuse block, but to the left of the horn relay. It has a brown, blue, black and a possible 10ga. red wire (this one isnt hooked up) connected to the relay and all taped together that comes out of the driver's side of the firewall. Could anybody tell me what this relay is used for and what the wires are indicated as? Thank you very much in advance! Darcy |
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#2 |
Registered User
Join Date: Jul 2014
Location: Hanna, Alberta
Posts: 30
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Re: Under Dash Relay??
Sorry for the mess of wires. The relay is circled in yellow!
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#3 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Under Dash Relay??
That is probably the TCS relay. An emissions rely that the factory used to comply with EPA regs in the early days to control emissions by retarding the ignition timing . It stands for transmission controlled spark.
Here is another view.
__________________
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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#4 |
Registered User
Join Date: Jul 2014
Location: Hanna, Alberta
Posts: 30
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Re: Under Dash Relay??
Awesome, thanks for the information! Would that be a "should have" or "need to have" when I switch out my TH350 to a 700R4 or just throw it in the trash? Like I say, it looks like all the wires were cut about a foot and a half out of the firewall.
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#5 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
|
Re: Under Dash Relay??
You won't need any of that stuff for the transmission. There may be a vacuum switch on the manifold and a switch on the stock transmission. There may be some wires and a relay on the firewall depending on what the original owner removed.
Here is a group of threads for some more information on the system. .....http://www.google.com/custom?domains...D%3A1%3B&hl=en
__________________
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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1972 c-10 pick up, firewall, fuse block, relay |
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