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> (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