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Do you have a new battery installed or not?
You shouldn't operate this without a good 12 VDC battery.
IF you do have a new battery in there and it isn't giving you 12VDC power, then check the polarity and be sure you got the leads hooked up correctly. If you aren't sure, give me the colors of the wiring and I can tell you which is which.
Just checking back in to see if you got this sorted out or if you need some additional input from me.........