Mike,
Here's a picture to show what SlingLow was writing about:
By running them in Parallel, you are essentially halving the Ohm (Resistance); in Series you double it.
Since you have a 4 Ohm Amp, and the speakers are supposed to be 2 Ohm, you need to wire in Series as shown on the right side above (exactly what SlingLow said).
Presuming the amp is still good, and you see (or feel) movement in the speakers, they are working.
HOWEVER, let's put some caveats in there: You are running 6.5" subwoofers (Really, just mids with the input frequency turned down) in an open cockpit with the speaker location facing away from your listening position - four strikes against getting good bass. You are NOT going to get great thump. You're not going to feel it in your stomach. You will hear some bass guitar and drums when at a stop light and the engine is idling, but that's it.
If you're wanting to really feel some thump, you will need to put 10" (or 12") subwoofers in a proper enclosure right behind your seat facing your back. And keep the stereo turned up and the engine rpm turned down. (Mind you, I am not telling you to do this - I am merely suggesting a realignment of expectations of what these speakers can do.)