OK I found a picture of your vest on eBay
The power comes in separate and the controller is on its own cord from the vest
Your gonna have to open up the vest and figure out what is what
But you should still have Battery + and - inside that controller
So trace it back to the battery input connection and find out why you don't
You may be able to jump out the existing controller and wire one on the input to the jack like all the other jackets
Does this controller plug into the vest with the 5 pin and has a separate lead for the 12 volt power in
Is so this controller must have a temp signal coming from the vest
Most electrically heated gear just have 2 wires going into them (12v + and -) and you can wire it up on a on-off switch or a variable out put controller
There are some vest that use 7.4 volts you may have that
Remember if you have no current load on a resistor you will show the same voltage on both ends
If you are not showing 12volt positive with respect to ground on any of those terminals in that controller
My guess is you have a fuse or a safety temp fuse or something inside the vest that may be open
I am wondering where does your gloves plug in
If they are dead try diagnosing them to find your problem
Gerbings usually run on 12 volts
I assume the gloves are plugging into the sleeves and they are dead
So the heating element in the vest is more than likely good