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Old 10-25-2014, 12:38 PM   #1
jtinpdx
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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
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Old 10-25-2014, 01:02 PM   #2
jtinpdx
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Re: What's this on the firewall?

Updated picture.
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Old 10-25-2014, 01:14 PM   #3
BlackedOut67shorty
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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.
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Old 10-25-2014, 01:31 PM   #4
adricar1
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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.
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Old 10-25-2014, 01:44 PM   #5
Daddy'O
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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.
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Old 10-25-2014, 03:13 PM   #6
48richard
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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.
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Old 10-25-2014, 03:53 PM   #7
jtinpdx
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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
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Old 10-26-2014, 04:31 PM   #8
jtinpdx
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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
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Last edited by jtinpdx; 10-26-2014 at 04:32 PM. Reason: Forgot photos
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