Have you looked at:

http://www.vanagondiesel.info/index.php/Coolant_System#Radiator_Fan_Electrical

I wrote it up for myself, and revised it for another I helped out recently.

> On Jul 19, 2016, at 9:02 PM, Poppie Jagersand <poppie.jagersand@YAHOO.CA> wrote:
> 
> Managed to make upper mounts:https://webdocs.cs.ualberta.ca/~jag/Pictures/UpperMounts/
> Still haven't figured out fan wiring.
> Martin
> 
>    On Tuesday, July 19, 2016 4:42 PM, Poppie Jagersand <poppie.jagersand@yahoo.ca> wrote:
> 
> 
> Hi,
> 
> Today I pulled a radiator assembly off an '86 non-AC vanagon to install in my '82 Diesel. I have some questions on (1) Wiring the fan. (2) Making an upper mount.
> 
> 1. Wiring the fan. I read the swap instruction on thesamaba:
> http://www.thesamba.com/vw/forum/viewtopic.php?t=297989
> 
> "Here's how to splice the new three prong temp sensor connector onto your existing wiring:
> The wiring will require a voltmeter or test light. There should be 4
> wires, 2 of a larger gauge and 2 of a smaller gauge.
> With all 4 wires unplugged, test them each for voltage to chassis
> ground. One of each pair will be live, so mark it.
> 
> The live wire of the smaller gauge is not needed so tape it off.
> The other small wire should go to the red/blue of the new pigtail.
> The large live wire should go to the red/white of the new pigtail.
> The other large wire should go to the red/black of the new pigtail."
> 
> I cut the wiring at the firewall on the '86. I don't have the same colors as in thesamba post. Also I don;t understand how the rad is grounded with the above instructions.
> 
> My wires are: Brown, Red, Red/white, Red/blue.
> 
> Why are there four wires going to the fan assembly? Since I cut the wires at the firewall, before the thermoswitch I had expected 2 wires: positive and ground.
> 
> Anyone knows how to splice up the '86 wires Brown, Red, Red/white, Red/blue to the '82 wires: 2 thick red, 2 thin brownish.
> 
> 2. I tried to break off the upper rad mount on the '86 donor, but the spotwelds held up very well and I couldn't get it off. Any suggestions for how to make an upper mount?
> 
> Thanks,
> Martin