Posts: 2753
Location: Mauston, Wisconsin | Guy's - This is a pretty complex issue, with many facets. Ubuck1 may be able to get away with it now, but that doesn't mean he will never have a problem. This type of connection effectively parallel's both batteries.
f. ex. If there is no switch to disconnect them when not on charge or you forget to open the switch. If you have a big motor and it's hard to start one very cold Novenber morning you may find yourself with some smoking wiring or a fire. Best case would be a blown fuse if it's sized to properly protect the wiring.
Even if the connection is only for recharge and there is a switch there can be other issues. The problem then is if one battery (trolling motor is deeply discharged) and the other (cranking battery) is fully charged when the switch is closed the batteries will equalize, i.e., the fully charged battery will instantaneously share current (equalize) with the discharged battery. This current can be very high and is in essence controlled by the connecting impedance and the impedances of the two batteries. Once again you could see smoking wires/fire or best case blown fuse.
I'm an electrical engineer by training and I would not do this, enough said!
Have fun!
Merry Christmas
Al
Edited by ESOX Maniac 12/21/2005 9:08 AM
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