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On Fri, 2005-03-25 at 18:31, Dave Hall wrote: > > DUHHHHH, Just sitting here thinking about it. Connect the coil of the > > isolator relay to the D+ of the generator. There is no voltage there > > until the engine starts and the generator is above it's cut in speed. > > 12V Gen. cut-in = 2200-2300 armature RPM = 1000 RPM crankshaft. approx. > > > > -- > > Russ Wolfe > > Russ, what's wrong with using the charging light output connection on the VR to > operate the relay for the second battery? It works fine on mine. When the main > battery begins to charge, there's 12V on that blue wire to turn off the warning > light. Not as sophisticated as Bosch's solution, but adequate for me. > Well, there is voltage on that terminal when the key is on. Yes, it is through the idiot light, but it depends on the inductance of the relay being used as to whether this voltage will pull the relay in. With using the D+ on the generator, you know it won't be pulled in until the engine starts. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~