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Old 05-26-2012, 08:54 PM   #1
Big Daddy 70
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What is this?

OK - I'm puzzled. What the heck is this thing, and do I need it? I would love to free up some real estate under the hood, but have no idea what this is.

Any ideas?

http://www.larrymead.com/p654999774/h1a90a49d#h1a90a49d

???
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Old 05-26-2012, 09:15 PM   #2
clinebarger
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Re: What is this?

Trailer brakes?
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Old 05-26-2012, 09:18 PM   #3
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Re: What is this?

Hmmm. Maybe! It does have the trailer brake console under the steering wheel. Must be part of that. Thanks!
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Old 05-26-2012, 09:24 PM   #4
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Re: What is this?

That's a mouse trap!!! It allows you to park you truck in the woods while hunting or camping and not get your wiring all chewed up...LOL

Last edited by Tuff Gong; 05-27-2012 at 01:28 AM.
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Old 05-26-2012, 09:29 PM   #5
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Re: What is this?

My truck had one of those and it did have trailer brakes, not sure if that was what it goes to. I removed it and a bought 10 lbs. of extra wire with no problem.
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Old 05-26-2012, 10:06 PM   #6
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Re: What is this?

Strange looking contraption. Can you trace the wires & see where they go?
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Old 05-26-2012, 10:41 PM   #7
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Re: What is this?

Radio interference thingamabob? Doesn't look to be used anymore in this pic(2 wires in same post-no third), is there a cut wire as well to trace?
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Old 05-26-2012, 11:29 PM   #8
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Re: What is this?

It is a variable resistor used with early brake controllers. Sometimes even in pairs. They helped tune the brakes to some extent, but nothing like today's controllers. Is the trailer controller plumbed into the brake system as well? As was pointed out it has been apparently bypassed and is now little more than a junction block.
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Old 05-27-2012, 08:29 AM   #9
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Re: What is this?

Yep.......It's definitely a resister. They were used on a many different types of DC voltage equipment. I have them on older electric palletjacks etc.
Replaced by electric controllers.
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Old 05-27-2012, 09:14 AM   #10
GASoline71
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Re: What is this?

It's a hot dog cooker!

Gary
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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

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I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
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Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
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Old 05-27-2012, 09:53 AM   #11
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Re: What is this?

Whatever you do, don't hit 88 mph until you have removed it.
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Old 05-27-2012, 11:19 AM   #12
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Re: What is this?

I found the same component mounted on my firewall by a PO. It was part of a Kelsey Hayes No. 81739 brake system of unknown vintage. I removed the entire system.
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Old 05-27-2012, 01:13 PM   #13
Big Daddy 70
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Re: What is this?

OK - crawled underneath today and found it was wired back to the connector for the trailer. Pulled the wire back to the "hot Dog cooker/mouse trap".

Traced the other wire back to the contriller on the dash. Found that the controller runs back to the the brake resevoir.

So it looks like it'll all come out pretty easily. Question though - if I remove the plumbing to the resevoir (and cap off the port), am I good to go? This won't affect the regular brakes - right?

Heres a few photos for those interested (finally figured out how to upload them correctly):
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Old 05-27-2012, 01:26 PM   #14
GASoline71
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Re: What is this?

You should be able to cap that no prob and use your brakes. If you get an air buble in the line... you might have to bleed the brakes.

Love the "wire nuts" on there. When I bought my 1972 GMC the PO had used solid core Romex wire and wire nuts to run the electric choke on the carb.

Gary
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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
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Old 05-27-2012, 01:37 PM   #15
Big Daddy 70
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Re: What is this?

Cool - thanks!
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Old 05-27-2012, 05:18 PM   #16
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Re: What is this?

That looks just like the one in mine, You should be able to remove that brass fitting and the brake line should go right into the MC. I would bleed the system.
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Old 05-27-2012, 05:36 PM   #17
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Thumbs up Re: What is this?

Quote:
Originally Posted by Daddy Brim View Post
You should be able to remove that brass fitting and the brake line should go right into the MC. I would bleed the system.
I agree -- no need to buy a plug, just eliminate the extra fitting.
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Old 05-27-2012, 06:23 PM   #18
Big Daddy 70
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Re: What is this?

Ahh - I didn't even notice the fitting was no longer needed once I take that off! I'll get that out of there when I get to my brakes.

Trying to sort out all the wiring. I've clipped back all the "extra" from the electric brakes. Now I'm just looking to see what is used and what is not used. What a mess!

Thanks for your help guys - look for more questions!

BTW - I have a flux capacitor/hot dog cooker/mouse trap for sale - let me know if you need one! They are very rare! :-)
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