Mech Power M90002 How to wire pressure switch?

by Adrian
(Miami)


Bought a Mech power M90002 that was missing a pressure switch.


Bought a pressure switch and wires but can't figure out where to wire it too. It look like the wiring was pretty butchered.

The compressor works fine (the guy has a really leaky quick connect) but obviously can't be used without the pressure switch.

Where do I route the pressure switch wires? I can't at all figure out were they are supposed to go no matter how hard I stare at it.

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Jul 14, 2018
Mech wiring
by: Doug in s.d.ca

"would I put the black wires going into the capacitor into the pressure switch?"

Only if they already connect to the black POWER CORD wire.

Can you post another pic or two that shows all or at least the majority of the wiring? I'm flyin' blind here...

BTW, does this have a manual switch on it now? Or do you have to unplug it? If there's a switch, just replace it with the PS.

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Jul 13, 2018
Black wires
by: Adrian

would I put the black wires going into the capacitor into the pressure switch?

Jul 13, 2018
Adrian says
by: Doug in s.d.ca

I guess he bypassed using those plastic caps. But there seems to be 3 black wires and one green.

Uhhhh - don't see that in the current pic.

Maybe he cut some wire off. Anyway, the black from the power cord is where the ps goes. Just follow it to a convenient connection, open it there, and insert the ps.

The green (or not the black or white) wire should be going to a ground point. If it's not, there should be a ground terminal on the switch for it.

Jul 13, 2018
Wires
by: Adrian

I’ve wired a lot of motors before, I’m just honestly perplexed at the Miami ingenuity that allows this compressor to run without a pressure switch. I guess he bypassed using those plastic caps. But there seems to be 3 black wires and one green.

Jul 13, 2018
Adrian -
by: Doug in s.d.ca

Oh! Duh, missed that it was working - maybe just ask the seller what he connected to make it work, and replace that spot with the switch.

It's probably where a couple of clean wires come together, if you want to look for that.

Jul 12, 2018
Wiring Mech Power M90002
by: Bill

Adrian, it appears as though the wiring process in not in your wheelhouse comfort zone.

Do make sure, before you play with any of the wires, that the power cord is NOT plugged into a socket, will you.

Jul 12, 2018
Plastic caps on Mech Power M90002 wires?
by: Adrian

Is it those wires with plastic caps?

Jul 12, 2018
Don't need to stare at your Mech M90002, follow the wires.
by: Doug in s.d.ca

Try this:

Start with the power cord at the end where it connects to the compressor.

Pick the black or white wire. Follow it - you'll get to the motor, or to a loose wire.

Repeat with the other wire.

Whichever one doesn't go to the motor goes to the switch.

And the other side of the motor goes to the other side of the switch.

(ignore wires that go to the capacitors when following, you're looking for loose ends)

Good luck and please keep us posted.

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