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If your wrench touches something metal while on the positive lead, you're going to have sparks whether the ground is connected or not. A short is a short. What you are talking about is what I was taught for jumper cables.

I do know that if you are welding, the neg lead should be pulled to keep from wrecking your battery. Now, welding on a bike is very unlikely but...
 

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If your wrench touches something metal while on the positive lead, you're going to have sparks whether the ground is connected or not. A short is a short.
I don’t think that’s correct. If the battery isn’t grounded to the chassis/frame, there’s nothing to short.

If you take an unconnected battery and run a voltmeter from the positive terminal to the motorcycle frame, you get nothing. If the ground cable is attached to the negative terminal when you do that, you get ~12V. Replace the voltmeter with a wrench and do it again, and you get... a light show... 😬
 

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Discussion Starter #24
UPDATE: I installed the new TST front turn signals with the optional running lights and everything works perfectly. Thanks again for all the advice.
 
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