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On 23 Mar 2005 at 20:03, Russ Wolfe wrote: > Also, I was just looking through some of my old notes from VW electrical > school, and found the complete specs on 6V and 12V generators. A 12V > generator has a cut in speed of 2200-2300 rpm. That is shaft speed of > the generator. And I think, Jim can correct me if I am wrong, we have > about a 2.3:1 ratio with the crankshaft. That means our generators start > charging at about 1000rpm crank speed. I tried to find this in Without Guesswork, but I couldn't, but 2.3 sounds right. > If you head lights dim at a stop light, turn you idle up a little. In all honesty, I really don't notice that mine dim when I'm stopped. I agree that they MUST, but I guess I just don't notice it. For most stops, the battery just droops slowly, and a healty battery won't drop below about 12.5 V, so maybe there's not all that much to notice. > And if you want more staying power, parallel a second battery under the > other side of the rear seat. I've done that. It sure lets you get a lot of extra years out of a battery, too. ;-) > Someplace I have the schematics to do this and wire it so when the > engine is off, you pull from the aux battery, and when the engine > starts, it automatically starts recharging off the system. I've never figured out a simple way to do this. There must be a good way to do it with a really big transistor, but I wasn't THAT interested. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~