250cc keeps burning up race CDI boxes

[G-gaurd]

Hi
I got this coolster 250cc water cooled single seat dune buggy the stock CDI is A/C 6 pin box and works just fine but the RPM'S are limited and I've been trying to put a race CDI box on it so I can open it up and have a little more fun

So far every Race CDI box I install as soon as I turn the key to crank it over it burns the box and I do mean burn ..... electrical burned smell from the aluminum boxes and the epoxy plastic boxes start smoking and hissing

The wires are all hooked up correctly and grounded ..... even after the race box failures I plug in the original stock box and the motor starts right up . So far I've cooked around 5 different race boxes both A/C and one D/C

6 pin box
2 pin is A/C power and kill switch
4 pin is pulse wire ... coil wire and 2 ground wires

I'm totally baffled and I hope there is a way to run a race box

Thanks in advance for any and all assistance

[Fairtax4me]

Somethings just being hooked up wrong. It sounds like its getting DC power into the AC sense side and that's going to cook it every time.
Got a part number for these CDI boxes?
Pics of your wiring?

[G-gaurd]

I can't post any pics for some reason .... the racing CDI boxes are the basic aftermarket .... the original box is a little bit larger than most boxes .... I've checked the wires for a D/C input but that isn't the issue ..... I abandoned the ground wire from the harness to directly go from the box to the frame .... I have one remaining Race CDI box I'm going to try ....

Unless there's power coming in through the pulse coil from the battery then I'm gonna probably replace the stator and voltage regulator and see what happens

[G-gaurd]

I feel stupid .... it's a D/C box ..... all good now

WOO HOO !!!!