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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