What is this Plug? Pics inside!
 

Can anyone tell me what this is? I have no wires running to it? It is on the passenger side firewall?

Re: What is this Plug? Pics inside!
 

Compressor relay

Re: What is this Plug? Pics inside!
 

Compressor relay? So what was it used for on the original equipment? I have a new 383 installed now.

Re: What is this Plug? Pics inside!
 

It was for the A/C compressor.

Re: What is this Plug? Pics inside!
 

Unless someone moved it to there it's not for the AC that I know of. The AC relay is inside on my 71 cab.
It maybe a relay for something at one time though.;):chevy:



http://67-72chevytrucks.com/vboard/a...1&d=1370830267

Re: What is this Plug? Pics inside!
 

If its for the AC Compressor, Should it be hooked up to it? I do have an updated Compressor that was put on, along with the new motor?

Re: What is this Plug? Pics inside!
 

I believe that's the relay that keeps it from Dieseling.I can't remember what it's actually called.
Maybe anti-dieseling relay?

Re: What is this Plug? Pics inside!
 

Attachment 1153517

Not sure if its the same relay but I have one on my non a/c '70 It goes to a vac solenoid on the intake. The vac lines go to the vac advance on the distributor. I figured it was some kind of California emissions or something?

Re: What is this Plug? Pics inside!
 

It is not relay for a/c it is a relay for tcs ( transmission controlled spark) it was connected to trans and vac advance and pulled timing out when truck sent into high gear. It was early emission device and had a vac solenoid that was electric and vac. Operated. On intake.
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Re: What is this Plug? Pics inside!
 

I'm with 72 super on this me. Pretty sure it is the TCS relay (having recently done a fair bit of research on the the TCS). You can search the forum for TCS and yo should find similar pictures of a relay in the same spot.
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Re: What is this Plug? Pics inside!
 

Thanks Guys!!! Its getting removed and thrown in the trash!!!