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Posted by David Sherman [72.47.9.228] on Friday, February 18, 2011 at 21:17:48 :
In Reply to: Timing light question posted by Tim Holloway [69.54.28.229] on Friday, February 18, 2011 at 20:43:08 :
Yes, that's fine. For the little bit of current the timing light draws and the short time it's on, just connect it to one of the 12 volt batteries in your 24 volt system, assuming you're not using a single 24 volt battery like a 4HN. Yes it will theoretically unbalance the charge in the batteries, but it's too little to hurt anything. You can hook it across either battery since the timing light is floating and insulated relative to ground. I once accidentally hooked my timing light to 24 volt and it fried it, so don't do that.
If you're working on an M37 with military wires, the inductive pickup will not pick up the spark signal through the braid. I made an adapter that gives me a short length of regular wire that I can put between the spark plug and the military wire so I can clip a timing light on there. There is an original military adapter for that, but it won't work with an inductive timing light. It has a terminal on the side that you clip to an old-fashioned timing light where the spark voltage actually fires the strobe directly rather than via a transistorized circuit.
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