No it't won't do anything UNLESS you also hook the 12V positive to something on the 6V unit, and even then as long as there's no path for the batteries to hook together it shouldn't effect much. Also think it you hook the negative of you 12 volt to the positive of you 6 volt you should see 18V between the positive of the 12 volt and the negative of the 6 volt that's a series connection if you hook them in parallel I'm not sure what would happen, but I would suspect a discharged 12 volt and an overcharged 6 Volt. Your timing light is getting 12 volt power from you auxiliary battery all it's getting from the 6 volt system is the signal it picks up from the inductive clamp on the spark lead, you need to ad the ground so it can reference between the spark/inductive load and the ground it is jumping to
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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