Mods: Please delete my older post here: https://mercedesforum.com/forum/dies...details-55914/

NEW POST:

I need help with the wiring for the A/C system, please?

It's blistering hot here & we're stopped dead in the process of fixing the A/C without some information.

1983 300D-Turbo

I've included a console picture in case it helps to ID the type of wiring.

Sure appreciate anything anyone can share ... thanks!

 

This YouTube video helped with getting at the switches:

https://www.youtube.com/watch?v=lCUdGjhr0E4

Once inside the console everything appears intact.

In the engine compartment - are just the two wires to the compressor everything needed?

There's a second insulated run with two wires that runs down near the compressor, to which a prior owner added some wire, but it's not apparent to what that may belong.

There is no break in the wires to the compressor - though the connector seems to float a but - is that normal - or does it suggest a potential problem?

Thanks!

 

OK, finally got back to this ...

Unplugged at compressor and Ohm meter shows a change when the hot/cold wheel is turned on the console & also when the left most button - defroster - is pressed.

Next, with the car running the voltage reading is only a trace at.0049 but it does vary when the hot/cold wheel is turned (suggesting that the level-control rheostat is working).

Where best to start looking for the cause of 12v not getting to the compressor connector, please?

Lacking a wiring diagram & pics it's unclear if I'm tracing to a relay at some unknown location or to a fuse somewhere.

Thanks - David

 

Here is about everything I needed ... Searching can be an art - finding stuff often depends on how one asks the question.

Compressor Relay in 83 300D Turbo??? - Mercedes-Benz Forum

 

I just tried to read that diagram & it's not easy.

Anyone have a better scan, please?

Preferably something I can print full page - not that my eyes are aging or anything ...

We may finally get this thing fixed - and before the hot weather has passed.

Thanks - David

 

Can someone suggest a place that I can get the needed diagram?

Why is such a piece of critical data such a pain to locate?

It's so frustrating to be unable to troubleshoot for lack of simple documentation.

Sigh ... thanks ... David