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All battery switches/disconnects I've seen are supposed to be wired in the positive side of the electrical system circuit. At the same time, my motor's manual (C40TLRX) states in the procedure for disconnecting the battery, to "connect the red (positive) lead first (when installing, disconnect last when removing)... otherwise the electrical system can be damaged". This appears contradictory: the manual connect/disconnect procedure interrupts or leaves open the ground side, the switch interrupts the positive side....? Does a switch do something differently (cleanly), protecting the system, where the manual process can result in something less than a clean connect/disconnect, or is there another reason...? Thanks for any info.....
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its mostly a holdover from the automotive and aluminium hull world.
the biggest reason we ALWAYS dissconected the negative first was???
are ya ready???
sitting at the edge of your seat????
technician error
.
let down huh?
if you remove the ground first on a negative ground system and the wrench makes contact with a ground no sparks.
guess what happens when that box end wrench on the positive cable nut contacts the negative ground???
instand welding and possibly fire or a battery explosion.
go back prior to about 1948 and look at at the manuals and it will say remove the positive first.
wanna guess why ???
so to answer your question, its a matter of safty protocol. -
Yea, that is what I always heard before also.
Same as jumping a dead or low battery, always hook up the +'s first and then hook up the -'s and make sure the last connection is not on the battery post but on a frame or metal part away from the battery as any H2 build up in a battery case can and will blow a battery up if the conditions are right and a spark of any kind ignites it.
Never seen one blow up myself but I did once lose a few of the single cell caps on a 68 GMC PU when it popped and they went flying ricocheting off the raised hood. Glad my face was not over it at that time.Comment
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