In a 2 wire 12v power cable the negative goes to pins 1 & 6. Positive goes to pins 3 & 4.
Because there are 3 ways to attach batteries there are 3 different power cables. They are not interchangable.
1) 12v 2 wire: +12 to pins 3 & 4, -12v to pins 1 & 6
2) 24v 3 wire: +24v to pin 4, 12v tap to pins 3 & 6, -24 to pin 1
3) 24v 2 wire: +24v to pin 4, -24v to pin 1
The 3 wire is used where you have 2 12v batteries in series. tapping at 12v allows you to use the vibrator supply.
Remember that the dynamotor sucks current big time on spin up. It can often trip power supplies that can't provide the juice.
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