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Thanks a million! I'll try it out. I actually think I might have that zener diode laying around. :) Johnny '62 Bug '65 Type 3 Karmann Ghia '68 Sunroof Bug johnnyvw@earthlink.net http://home.earthlink.net/~johnnyvw/ Janne Laaksonen wrote: > > (any suggestions on resister > > size?) > > Put small zener-diode in series, for example 6.8V. It drops that 6.8V from > your cars 14V, so clock gets 7.2V when car is running. I think that is OK. > > You need to put small enough (in watts) zener to it, 1W would be OK. > Otherwise leak current of zener is too big and it won't work. > > Janne > > 67 variant