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When I connect it to the - buss and + buss in the battery box I get 190.00ish this is set on DCV 200. When set on DCV 20 the numbers go up and then get a number 1 as a it’s over the limit of what it can read. I get the moving from 20 to 200 just moves the decimal. The tester some times not...

Thinking my cheap multimeter is not working right. The thing is all over the place. I tried the low speed on the fan kinda got the same results as before. I plugged in the water valve (435B) and lose power to the (435D) . Seems like the water heater valve is connected in some sort of way...

Awesome info! I’ll give that a try. Thanks for all the help!

The high and low fan speed work. I also have power to the right rear cond. fan if unplugged from dryer and jumped together.

Tested some more wires today. Not sure how many volts I’m suppose to get but figured 24v. Got around 14+ until I got to front Evan temp switch. Got nothing on the 438 wire on other side. By passed it and then got nothing on the other side of the low pressure switch 436C. I notice I wouldn’t get...

Thank you!

Also noticed the heater core attached to blower/ac unit was hot. Was running it on AC high fan?

So I attempted to put some r134a in but it did nothing. Nothing kicked on. Tried jumping the wires between both low and high pressure switches nothing. Followed wires to see where they went and connections. So I found a wired connector that’s capped off. Looks correct? Picture attached. what I...

Do you think those measurements are low causing it to not engage the compressor or do I have a compressor problem.

This one might be a random fix. I just took my truck for a drive…..been fixing and painting it for some time. Went down the street and the cab filled with exhaust/smoke. Well upon further inspection I found that the vent/pipe that crosses over the engine was gone/ never there since I got it. So...

Haha figured I had it backwards. Any chance you have a similar reading on the gauges when off? I think I might go and put some R134A in and see what happens.

Smaller connection/blue side is high pressure and bigger connection/red side is low pressure side. And again these are readings when the truck is off.

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Attached

So I put some gauges on the unit today while it was off. And got some pressure in there. I didn’t bother trying it while on due to the clutch not engaging. Attached is a picture of what I got. In addition I can turn the clutch by hand. Any ideas on what to try next? How to jump it to get clutch...

Got around to testing some stuff. So my volt meter wasn’t work. I just jumped the wires on the dryer and the fans turned on under the wheel well. I did not see the clutch engaging on the a/c compressor. Also the fan under the wheel well was running while in heat mode and when fan on dash was...

The attached picture I believe is the air dryer wiring. There appears to be three wires from the relay. I’ll test it to see if I get 24v.

Awesome information!!! Thank you for taking the time to help me out!

I have an M1152A1 with the stock2 man A/C unit. I am just getting into the stage of fixing the A/C. The fan switch works on the dash. The vents blow air but it’s not blowing cold. I don’t hear the fans under the right rear wheel well turn on. I did hear them come on once before for a second...

Will do. Thank you!