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On 4 Apr 2006 at 12:34, Chris Wright wrote: > Both the original 6v round one fitted to my 64 T34 and the rectangular > spare (which has 311 941 531B moulded in the cast metal back) have a max > resistance of approx 33 ohms measured between 30 and 58b. This doesn't > equate to your 6v resistance! Maybe my DVM is in need of replacement! Your DVM is probably fine. Because of bad connections within the switches I was measuring, I had to measure resistance between a pair of rivets so I could get something stable. Even then, I couldn't swear that I got it exactly right. I only persisted long enough to convince myself that I could tell a difference between 6V and 12V rheostats. > I was wrong about the A and B suffixes. As far as I can see, > disregarding the prefix numbers, the A suffix was up to 1957 for T1 and > T14, the B suffix was originally the same round shape and was changed to > a rectangular one in late 64 (65 model year?) and went up to 67, I > can't see any references to C or D suffixes, the 12v version from 67 on > seems to have had an E suffix and I've seen a reference to an F suffix > which from what you've said, was 71 on? 67 should be different from 66 because of the voltage change, but I suppose it's possible that VW goofed and didn't change the resistance in 67 when type 3s went to 12V. I don't know. Does anyone out there have a 67 so you can tell us whether you can adjust the dash lights significantly, just like on the later cars? I believe the 68 switch is probably different from the 67 switch, just because of the change in knob style, but I'm just guessing about that. The E suffix has to be something that superceeded what came on our cars. None of the late (68-72) switches in my stash has any suffix at all. They are all 113 941 531 with no suffix; some have die cast cases and some are in stamped alum cases, different OEMs. The only old switch I have here is apparently correct for 65 (and maybe 66) and it has no number on it. It's unfortunate that I can't read the microfilm in this area. I should drag out my old paper parts manual and see if those parts are legible in it. It's sometimes useful because the paper copy is older and often shows things as they were before things got superceeded. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~