ID of this electrical component?

Discussion in 'Electrical & Audio' started by Gdub, Dec 4, 2017.

  1. Gdub

    Gdub Junior Member

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    I'm in the process of repairing some bogus and burnt wiring under and behind the dash of a new-to-me 1973 C20, and found something that is unfamiliar to me. It's a spring loaded switch mounted on the bracket immediately above the gas pedal (see green arrow in photo). It's a two pin switch fed by orange and brown/white wires. The orange wire goes out through the firewall near the fuse block, while the brown/white wire terminates in a pair of red connectors (shown in second photo). I tried searching, but have no idea what it's called.

    Can anyone tell me what the heck this thing is? Thanks!

    [​IMG]

    [​IMG]
     
  2. Rusty Nail

    Rusty Nail Build the wall deport them all!

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    Trailer brake connects?
    I don't know lol a trailer harness connector is my guess!
     
  3. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    If it’s a TH400 truck it could quite possibly be the kick down switch
     
  4. Rusty Nail

    Rusty Nail Build the wall deport them all!

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    Lol he don't know either...:hidesbehindsofa::hmm:

    :lol:

    They aren't in my Blazer.
    (a th-400 truck)
     
  5. Gdub

    Gdub Junior Member

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  6. Rusty Nail

    Rusty Nail Build the wall deport them all!

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    Wtf. Y i no has ones?
     
  7. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    It’s probably mounted to your carb or has been removed
     
  8. bucket

    bucket Super Moderator Staff Member

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    Yours shouldn't have had a th400 in it from the factory. Even with the optional sbc400, K5's and K10 Burbs got the th350 it seems. I don't know about pickups, but it was likely the same.
     
  9. gmachinz

    gmachinz Full Access Member

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    1972 was the last year fornthe carb mounted TH400 kickdown...which imo is a nicer setup
     
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  10. donnieray

    donnieray Talks to dogs and trucks. Supporting Member

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    My 86 C10 has that kick down switch.
     
  11. Rusty Nail

    Rusty Nail Build the wall deport them all!

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    Im curious about the plugs.
    Poor truck has gone from a 400/400 to a 350/350.

    IMG_20160505_194056_2.jpg
     
  12. bucket

    bucket Super Moderator Staff Member

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    That just says turbo hydramatic, it doesn't specify which.

    My old white '77 K5 was equipped the same way, 400sbc with 3.73 gears. And a th350. Same goes for all the other 400 engined K5's and K10 Burbs I've encountered. The only exception is the M1009 units.
     
  13. chengny

    chengny Full Access Member

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    X2 - prior to 1977 (I think) an M40 RPO was common to both the TH350 & TH400. Which version was installed depended mainly on the engine size/type.
     
  14. Rusty Nail

    Rusty Nail Build the wall deport them all!

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    I figured m40 was a 400. The th350 seems adequate and I have no evidence of anything else. Absolutely NOTHING looks fishy about that truck. It's actually right as rain.
    I've always thought about paying the heritage dudes for their info. It would seem that more info is necessary but I really don't care.
    I do shop for th400-np203 adaptors though. Readily available for like $140. I stay on the lookout for a cheap th400 too. It'll may happen one day! Think i'll fix the A/C first lol!

    My apologies to the OP, but this thread was over anyways?

    Thanks men.
     

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