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I have a coke vendo 39 that has its original compressor. I had to change out the thermo because all my pop froze and exploded. After I replaced the thermo after a week of running great I went to get a pop and it was blowing hot air. so I made a post and they told me to try and put a dryer on the line. After 2 months the guy finally came by and put it on and it cycled and started to cool. At lunch the next day I went to get a cold pop and you guessed it warm pop again.It turns on for about 30 sec then shuts off and keeps repeating   So after $250 and a few hrs of working im back to where I started. Is there a way I can just wire it straight to compressor to make sure it is done before I buy a new one and its not the relay? I remember reading somewhere on here that you can, if so does anyone have a wiring guide for dummies (I mean real dummy...LOL)....thanks for your time kevin G

forgot to mention when the guy put dryer on he vacuumed everything out, put in new stuff and said compression levels were good. Don't know if a 3-1 switch would help?

How comfortable are you with working with electricity?
When the tech. installed the filter drier what type of refrigerant did he use?
Some new refrigerants won't work in old compressors. Might have blown compressor

      So the system is fully charged now, but after he left the electrical stuff failed?  :darn: 
      This is a different problem, but yes try installing a 3 in 1 relay............. you can do it yourself!

Ok read on here where someone on here used a rubber mallet to free compressor. So I plugged it in and played wayk a mole and it started and cooled down, but when it went to cycle it didn't come back on...so do you think a 3-1 will fix my problem?

Yes a 3 to 1 start relay would plug into the original compressor bypassing the 70 year old original relay.  You can find them at any local appliance store if you are in a hurry you can get one from one of the site sponsors!

You can wire a new one up in less than 5 mins...

ok i bought the 3-1 and want to make sure im cutting the right wire. i found a video on youtube but mine doesnt have the same box. I assume im to pull the plug right at the compressor and cut plug end off?

if allowed here is video i found

http://youtu.be/H6xUI7aXY_A

Unplug any existing relay out if the start / overload box.  The 3 to 1 ( new one ) will have a spade terminal on each wire plug one to each the the start / overload of the compressor.

The old relay is a little plastic box when loosened will slip right out the small cover housing area.

The other wires are explained well in the video!

That's a pretty good video.  Watch a few more times and you will get it!!! :biggrin:

That's what I'm talking about if you look at my compressor pic attached I don't have a box just a direct plug. Is that what I cut

There would be 2 wires that connect from the original relay to the start and overload on the compressor .  They should have small spare terminal on them.  Pull those 2 wires off.  Those wires should go to the old relay.  When removed properly you should be holding in your hand the old plastic relay that has 2 wires coming out of it.  

Does the new start relay have spade terminals in the the end of the 2 wires?

If you look at the picture I don't see a old relay.....all I see is one plug going into compressor no box just 1 plug

The old relay is the plastic piece directly above the green tag on the right upper corner .

Just follow the wire to the circle of the left side of the picture and unplug it...

Ok I guess I was explaining wrong but that circle is what I meant...ok take it off and use what wire is left attached and use 3-1....

Yes there should be two connections slots on the circle ( start / overload) plug the 2 wires from the new 3 to 1 into it.  The remaining wires are your power to the relay, ground, etc.

       The problem is your picture, it's too small to identify your style compressor.  :biggrin:
If you have the early model 39 I believe they were different, does that thermostat and relay share the same box?
But if so, how did you install your t/s?  Anyhow, the 3 in 1 would still need to be mounted directly to the side of the compressor but you will not use those slip-on terminals, rather you will need to cut them off and install ring terminals
then wire them in the same order as shown in the video.

Every time I tried putting photo on it said it was to big. That's my problem there is no box just a 2 wire plug straight to side of compressor. I'm going to try and pull plug and re take photo before I cut..the stat ran to junk ion box with compressor fan

Sorry for all the posts but i don't want to cut something i shouldn't. Lets see if this helps me i made a video of my compressor to try and show what i think should be cut...thanks again kevin

https://www.youtube.com/watch?v=ywhNrhyxk_0

I was having the hard time with the picture I was assuming it was slip on type like many compressors!

So what I was saying on video correct. Cut circle peace off near compressor not black box on bottom

ok this is what i found when i pulled cap off........is the plastic box on bottom what i am to eliminate? not the plug

https://www.youtube.com/watch?v=_IJe1zcGqXA

       Wow, that must be a Canadian compressor, I have never seen a pecker head with so many terminals.
Our compressors only have 3 terminals : start, common and run.

So does that mean I can't use 3-1?

replied to your PM, hope this helps, if you have an OHM-meter you could sort it out in about ten minutes,
( I could any way)  :biggrin: