So, you see, jcarroll, it depends on whether the machine that you are working on utilizes pos or neg ground.
The primary idea is to first wrench on whichever battery terminal (pos or neg) is tied to the chassis (ground), because if that wrench comes in contact with the chassis metal parts, there will be no spark. Then once that cable is disconnected, when wrenching on the other battery terminal, if that wrench contacts the chassis, there will also be no spark. Do it in reverse of this & you will make fire & sparks upon wrench contact!
So, in summary, it isn't whether to disconnect pos or neg first, but rather disconnect whichever is tied to chassis first.
This post was edited by JMOR at 08:23:36 05/15/14.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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