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Originally Posted by Andy A.
The only diffrence between a Red (old) and Blue (spike) is that the blue version has reverse polarity protection on the battery supply terminals.
Red versions will fry quite nicely if exposed to reverse current. Blue's won't.
-Andy A.
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I know that is the only effective difference that IFI states, however try it for yourself with a vex controller. I tried several (5 or so) different blue spikes from various years, including this year's ones in the new cases and previous years, and had the same problem with both, whereas the 2 red spikes i had worked fine, hooked up to the same 12V lines and the signal cable from the vex controller.