What's this on the firewall?
 

Hi All,
I was looking around the engine bay for a good place to mount a universal windshield washer pump and saw this on the firewall. What is it? It's near the power brakes on a 71 c10. Thanks!

Thanks,
Jeff

Re: What's this on the firewall?
 

Updated picture.

Re: What's this on the firewall?
 

To me it looks like a relay someone added but not %100 sure. Im going off my 67 so i dont know if 71 had something like that.

Re: What's this on the firewall?
 

My 71 has that relay, i believe ist something to do with the air con, but not got around to getting it working.

Re: What's this on the firewall?
 

That is the tcs ( transmission controlled spark ) setup. You can search for more information if you want. See this thread

http://67-72chevytrucks.com/vboard/s...=spark+control

as it has some good info.

Re: What's this on the firewall?
 

Like Daddy'O said, it's the TCS relays. Throw them out. if anyone wants to buy a set they can have mine.

Re: What's this on the firewall?
 

Excellent. Thanks, all! Seems like that'll make the perfect spot for a new washer pump once that relay is removed. Appreciate it.

-Jeff

Re: What's this on the firewall?
 

Deleted the TSC relay in favor of a working windshield washer pump. Thanks for the info, all!

-Jeff