TheSamba.com :: View topic - Fuel cut-off wiring for dual carbs?

Thu Jul 03, 2008 12:39 pm

noticing a big difference between the 64-66 T34 wiring diagram and the 67 diagram. the 64-66 doesn't show the cut off valves at all and also shows a wire heading directly from the choke to the fuse block.
the 67 shows the cutoff valve -> choke -> coil setup that I'm familiar with. mine is a 66 but switched to 12V.

when did the cutoff valves come into use?

why a wire forward to the fuse block?

I'm trying to figure out why there is a disconnected wire in my engine bay that I can't account for on the wiring diagram. It looks original and is in the area of the right cutoff valve...

Sat Jul 05, 2008 6:59 am

abgwin wrote:
I'm trying to figure out why there is a disconnected wire in my engine bay that I can't account for on the wiring diagram. It looks original and is in the area of the right cutoff valve...

Trunk light? A way to check would be to ohm meter it to either the left or right tail light, in the parking/running light posistion. I only say that, because VW powered the trunk light while the parking/running lights were on (at least my 65 Notch, and my wife's 70 Fastback are like this).

Sat Jul 05, 2008 7:12 am

great thought, but one I already had. My trunk light is in place and wiring is there. Chewed through, but there.
I'm about to conclude that this was the original choke wiring that was made obsolete by the 12V choke/cutoff wiring that's direct to coil.

Sat Jul 05, 2008 8:19 am

abgwin wrote: when did the cutoff valves come into use?

why a wire forward to the fuse block?

I'm trying to figure out why there is a disconnected wire in my engine bay that I can't account for on the wiring diagram. It looks original and is in the area of the right cutoff valve...

Cut off valves came in to use in 1966. Prior to that, it would have just been the chokes.
Can you get a picture of the wire?? Maybe I will recognize it. Or I can compare it to my 66 fastback or 64 T34.

Sat Jul 05, 2008 9:41 am

Russ Wolfe wrote: Cut off valves came in to use in 1966. Prior to that, it would have just been the chokes.

well, that blows my theory, doesn't it?

here's the wire in question:

note that you probably can't see it, but it runs along the passenger side of the engine bay forward. It ends very near the carb and falls naturally beside it, as if it was once attached there. I have not gotten underneath to trace it yet, but all my running lights and such are accounted for.

Sat Jul 05, 2008 4:04 pm

That wire may be for the back up lights.

Sat Jul 05, 2008 4:07 pm

would make sense, except mine is a 66 and does not have reverse lights. as far as I know, reverse lights were optional on T34 at least until 68 and may have always been, since they weren't officially for export to the US.

Sat Jul 05, 2008 4:21 pm

I noticed the rear bumper on your car has a couple of holes in it. A previous owner may have removed the lights & just cut the wires. Back up lights were optional on '66 & earlier models. There were 2 types of back up light switches used one style was a switch that mounted on the back of the speedometer, another style was a switch mounted to the shifter rod near the shifter coupler.

Sat Jul 05, 2008 4:26 pm

I think the left rear bumper corner was replaced at some time. The lens on the same side is amber & red and is missing the seal, so I suspect that it had a minor accident that damaged the bumper corner and lens.

The right side bumper is not drilled and the all-red lens is intact.

You could be right, though, and a previous owner may have installed reverse lights at some time, only to remove them later. That wouldn't account for the undrilled right bumper, but then again - the middle section is drilled too, which I can't explain.

Previous owners are wacky folks, huh?

Sat Jul 05, 2008 4:44 pm

rustyfastback wrote: I noticed the rear bumper on your car has a couple of holes in it. A previous owner may have removed the lights & just cut the wires. Back up lights were optional on '66 & earlier models. There were 2 types of back up light switches used one style was a switch that mounted on the back of the speedometer, another style was a switch mounted to the shifter rod near the shifter coupler.

Yeah, my 65 had the speedo style switch in it when I got it. I still have the switch, but I've got a later trans in it now.

Sat Jul 05, 2008 5:00 pm

The wiring on the earlier T-3s is a little different. 6V cars originally had the coil mounted to the right of the crankcase breather. The power wire came in to the engine bay, and connected to the left choke housing, then doubled back on itself into the loom, and went on across to the coil. From there, it went on to the right choke.
Below is a picture of the OG wiring in my 64 T-34. Sorry it is not better, but I had to crawl under the car to get the picture.

Sat Jul 05, 2008 5:47 pm

An unmolested 66 engine compartment. No extra wires for the chokes, or solenoids. They were a seperate harness that was fed off the coil.

And Bob, here is the picture you were wanting.

http://classicvw.org/gallery2/d/10576-2/DSCF0016.JPG

Sat Jul 05, 2008 7:34 pm

Russ Wolfe wrote: And Bob, here is the picture you were wanting.

http://classicvw.org/gallery2/d/10576-2/DSCF0016.JPG

Thanks Russ, I really appreciate it. 8)