My little compressor went.. Well nothing

[BigRAWesty]

Well it was working last trip, did 8 tires, then nothing...
And I think I know the issue but not sure why it's wired like it is..
http://www.nissanpatrol.com.au/forums/images/imported/2012/11/24.jpg
http://www.nissanpatrol.com.au/forums/images/imported/2012/11/25.jpg
http://www.nissanpatrol.com.au/forums/images/imported/2012/11/26.jpg

So + power comes threw the case to the solenoid and continues to the motor. Earth is a general earth (soldered together under the cap.)
The orange wire runs power to the switch, then switch to inside the motor case (first WTF) then back out to the solenoid, across it and out to the general earth to open and close it..
But (2nd WTF) what is that yellow thing jumping across the open/close points of the solenoid?? Does it need to be there. What does it do??
http://www.nissanpatrol.com.au/forums/images/imported/2012/11/27.jpg
Any help??


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[threedogs]

Not your thermo cut out is it , pain in butt at beaest of time dic=s connect and try, GOOD llucK

[Yendor]

I would say the first WTF would be the wiring going to the temperature switch.

The second WTF is a capacitor, if it's across the switch terminals of the relay I would say it to stop the relay from chattering on and off.

[happygu]

Westy,

It will either be the Thermo Safety Cutout in the motor body ( Most Likely ), the Motor Itself ( Likely ), or the Solenoid itelf ( less Likely ) as long as you are getting 12 Power to the Compressor.

You should be able to determine if it is the Thermo-Safety Cutout, Solenoid, or the motor, by using your multimeter and checking voltage.

The yellow Block is definitely a capacitor, and isn't required to make it work as such, since it will work without it, but it is unlikely to be the cause of the compressor not operating.

[BigRAWesty]

Cheers guys. Well I'd hope it's not the temp switch unless it's kaput because it's only 18 degrees when I tried to use it and mid 20's when I used it last..
But it's not the first one to have temp sensor fail on me..
I'll dig a little deeper..


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[macca]

The cap is to stop spikes in voltage as the solonoid contacts open / close, on a DC circuit the voltage can get quite high (it acts similar to a coil ignition when the points open). But it appears to be across the coil which I would have thought to be unnessasary.

Do you have a voltmeter?, there should be 12DC either side of the cap, if not switch isnt working or the thermal has failed.

The cables in and out of the motor are thermals, you could bypass the thermal to test that is your problem.

Could also be the solonoid coil is open circuit and wont pull the motor contacts in so motor no go as you have found.

[threedogs]

Is it a quality compressor or a cheap init???

[BigRAWesty]

Mid range. It's a HD Projecta 75L/ min 150psi.

I have a fault light and I think I know were to test next.. The switch does work. I have power coming across the switch.




Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[BigRAWesty]

Quick question. How well do they work under the bonnet if I bypass the temp sensor as I think this is my fault..


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[Yendor]

It will work well until the smoke comes out.

[BigRAWesty]

It will work well until the smoke comes out.

Yes I have realized this. But has anyone had it happen, or just the temp sensor cut out??


Kallen Westbrook
Owner of
Westy's Accessories (http://www.nissanpatrol.com.au/forums/showthread.php?15134-Westy-s-Accessories.-A-small-back-yard-builder.)

[happygu]

The Temp Sensor is designed to shut the compressor down if it is worked too hard. The motor windings will get hot, and if they get too hot, the windings could melt or the unit itself catch fire.

I wouldn't disconnect it permanently, but as a temporary solution to get you out of a hole just disconnect it by cutting and joining the wires ( in effect you are just cutting another switch out of the circuit )

[BigRAWesty]

Update.. Well I went digging.. The temp sensor was nowhere near anything.. It was stuck under the mounting plate for the brushes... A good 10mm from anything..
After cutting everything off it turns out the solenoid was stuffed.. Well now it's a direct motor to battery with 30A fuse in it.. Kiss...

[macca]

Update.. Well I went digging.. The temp sensor was nowhere near anything.. It was stuck under the mounting plate for the brushes... A good 10mm from anything..
After cutting everything off it turns out the solenoid was stuffed.. Well now it's a direct motor to battery with 30A fuse in it.. Kiss...



Could also be the solonoid coil is open circuit and wont pull the motor contacts in so motor no go as you have found.

MMMMmmmmm did mention that one LOL

Least you have it working now, KISS is good

[threedogs]

Some compressors don't like it under the bonnet, just the radiant heat from engine will stop them working. recess them into rear 1/4 panel or mount under a seat somewhere. Can always run breather like a snorkle to get clean air not Elephant science. if thats a science, .recess it in rear 1/4 panel .had mine in rear small door on other 4x4 with spring loaded door. just make sure wires are adequate

[BigRAWesty]

Some compressors don't like it under the bonnet, just the radiant heat from engine will stop them working. recess them into rear 1/4 panel or mount under a seat somewhere. Can always run breather like a snorkle to get clean air not Elephant science. if thats a science, .recess it in rear 1/4 panel .had mine in rear small door on other 4x4 with spring loaded door. just make sure wires are adequate

Yea that's what happened to my first compressor under the bonnet.. It lasted a week.. I got it under warranty because it disentangle state not to mount under bonnet.. :p

But I was going to build this one into my draw system..