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Wed Apr 30, 2008 12:27 pm

The PO of my bus had a 1600 d.p in my 73. I switched it back to a type 4 and have been trying to get the heating system going. I have everything installed but cannot find how to wire the blower motor. I have all sorts of color wires that I cannot find any that have any voltage to them when I have the heat levers pushed to max. There are 2 wires coming out of the blower motor and the colors don't match any of these wires in the birds nest of wires pictured. I read in some previous posts about having some sort of relay. But I think if there was one the PO removed it. Here are some pics of my wiring if someone could tell me wehich wire was supposed to be the one that carries the power to the motor.

My other thought would be couldn't I just run a fused hot wire from the battery to the motor and wire a toggle switch in the cabin to turn the motor on/off? I would rather do it the right way through the heater lever because I already am getting too many toggle switches up front but it might just be easier.

Wed Apr 30, 2008 1:02 pm

The blower motor does very little except at a low idle and even then it doesn't do much. If you don't spend much time sitting still in traffic you will never know it is not there. However if you don't use it then you need to block off the duct work going to the heat exchanger.

The blower used a relay to activate the fan and in some years the relay was powered off the stator so you would see no power unless the engine were running, on other years it was powered off the B+ circuit. I used the original aux fan circuitry to power an inline fan. That gives a noticeable increase in both heater air volume and temperature.

What is that hose that shows in your one picture?

Wed Apr 30, 2008 1:12 pm

I think the hose you are talking about if my fuel line.

I have read that the blower doesn't do much but I have it there and all the hoses hooked up I would like to just try it and see what happens. Do you see any problem with just trying to run it off a toggle swicth? I think that would just be easier and cheaper than buying the relay and tracing these stupid wires.

Wed Apr 30, 2008 3:24 pm

The original set up was there to keep it from running the battery down if left on and to prevent extra loads on the battery while starting. It also reduced the number of amps running from the back of the bus to the front and then to back again. Adding a toggle is probably not a problem if you always remember to turn it off though.

Wed Apr 30, 2008 3:34 pm

I rewired mine to run from a toggle switch (actually, I used a dome light switch from another bus, and put a "fan" sticker on it), and I prefer this over the lever-integrated switch.

Put a fuse in line, though. The original arrangement was (I believe) a black fuseholder in line with the red power wire to the fan, and mounted near it in the engine compartment.

Wed Apr 30, 2008 4:27 pm

If you decide to restore it to it's original configuration, here is the wiring diagram.

V4 is the motor, S25 is the inline fuse in the engine compartment, J14 is the relay, E16 is the switch built in to your right red heat lever on your dash which activates the relay. If the wiring is still there, it would be pretty easy to put it back the way it was. A general purpose automotive relay available at any FLAPS will work just fine if you don't want to find a genuine VW one.

Wed Apr 30, 2008 7:01 pm

Here's a few detail images of that harness.

(image from Ratwell's image bank)

Thu May 01, 2008 6:44 am

dtrumbo wrote: If you decide to restore it to it's original configuration, here is the wiring diagram.

V4 is the motor, S25 is the inline fuse in the engine compartment, J14 is the relay, E16 is the switch built in to your right red heat lever on your dash which activates the relay. If the wiring is still there, it would be pretty easy to put it back the way it was. A general purpose automotive relay available at any FLAPS will work just fine if you don't want to find a genuine VW one.

If you prefer to view a dedicated heating-system, blower-fan, electrical circuit diagram, here's the one I prepared, based upon what I did to retro-fit a 1972~79 VW 17/18/2000 Type 2 blower fan, in my 1973 VW 1600 Type 2.

This is the dashboard, heater-lever, combined spacer & switch contact E16

Sat Aug 30, 2008 5:39 pm

where does the blue wire go to in this picture? I just bought my bus a couple weeks ago and don't where it goes. I have a Bentley manual and I have looked at the wiring diagrams on this site. So please don't send me the link the diagrams. Any help would be appreciated. I almost forgot. Its for a 77 2.0LFI.

http://images.thesamba.com/vw/gallery/pix/437773.jpg

Mickey

Sun Aug 31, 2008 5:02 am

mickey86004 wrote: where does the blue wire go to in this picture? I just bought my bus a couple weeks ago and don't where it goes. I have a Bentley manual and I have looked at the wiring diagrams on this site. So please don't send me the link the diagrams. Any help would be appreciated. I almost forgot. Its for a 77 2.0LFI.

http://images.thesamba.com/vw/gallery/pix/437773.jpg

Mickey

Mickey.

That blue wire, from the alternator's voltage regulator, provides the switch-current for the blower-fan-motor's relay and should be connected to terminal-A of the relay J14, as shown on my hand-drawn diagram below.

Sun Aug 31, 2008 2:22 pm

I saw your diagram. In the pic is shows the black wire that goes to the coil going to "A" on the blower. and from I have read from doing searches on the forums. My blue wire should go to my oil pressure sender. Skeet, I did print out your diagram for the blower. Much appreciated!! The reason for my question is because the PO had a small engine fire and it got most of my compartments electrical. So I am just trying to make sure I get everything right.

Thanks

Mickey

Mon Sep 01, 2008 6:08 am

mickey86004 wrote: I saw your diagram. In the pic is shows the black wire that goes to the coil going to "A" on the blower. and from I have read from doing searches on the forums. My blue wire should go to my oil pressure sender. Skeet, I did print out your diagram for the blower. Much appreciated!! The reason for my question is because the PO had a small engine fire and it got most of my compartments electrical. So I am just trying to make sure I get everything right.

Thanks

Mickey

There should be no black wires, from the coil, connected to the blower-fan relay. However, there is a black wire from terminal-15 of the coil, via an in-line fuse holder, to the reversing lights (if fitted – uncommon on British specification VW Type 2s!).

Mon Sep 01, 2008 10:01 am

So yesterday contained more investigation work on this blower motor. I took that blue wire and with the battery disconnected of course from the rest of the electrical. I put the blue wire on the battery + and my oil light came up on my dash.

Mon Sep 01, 2008 10:54 am

Most likely because you powered the idiot light base circuit through the charge lamp. The blue wire is for the charge lamp and both it and the oil pressure wire make the idiot lights come on by grounding the appropriate wire.
The oil pressure is blue with green stripes, look harder. Your wiring on the back of the instrument cluster could be screwed up too, check the colors of the wires going to each bulb, easy to mix up.

Mon Sep 01, 2008 3:44 pm

My diagram in the Bentley manual (1977-1978 models) is different from the one posted above. If you follow the schematic. The black wire does hit the fan blower "A" and then ends at the coil. (Sorry for the small Picture)

Mickey

Mon Sep 01, 2008 5:45 pm

You are correct, VW ditched the charge light activated fan in 77 and it's activated by the ignition switch (black coil wire 15).

Mon Sep 01, 2008 8:43 pm

I am very thankful for Nigel's diagram. It is much easier to read, then that wonderful Bentley manual. I am replacing all my fuel lines and hoses so that way I will never have to put this electrical puzzle back together again! But, I can't complain to much because I got my bus at a great price because of that small engine fire.

Mickey

Tue Sep 16, 2008 5:56 pm

I have a question about the diagrams versus the posted images:

In the wiring diagram there appears to be 4 wires entering the heater relay (red, blue, brown/white, yellow/black). However, in the posted pics there is what appears to be 5 wires plugged into the relay. The part that gets me is: in the pic the only "blue" wire never hits the relay, but there are 2 black (or possibly dark dark blue) in the relay on the right side. What are these wires and where do they go?

Thanks, ian.
http://images.thesamba.com/vw/gallery/pix/437772.jpg

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Tue Sep 16, 2008 6:21 pm

From what I have learned. With a lot of help from this thread. Is in 77 they changed the wiring configuration on this relay. That black wire is the ignition wire. It hits the blower motor relay and then carries on and lands on #15 on the coil. The blue wire is for the oil pressure idiot light on the dash and should land on the oil pressure sender. From what I learned, 77 was the first year for this. Earlier years would be wired up like the hand drawn diagram. Hope this helps.

Mickey