Blackmesa

320 pounds + amp + enclosure, requires at least 5,000 WATTS out of your battery, why would anyone put that in a car? That is utterly stupid.

I dont think they have direct adaptors, so i think what you will have to do is, split it into two mono's then combine it into stereo like such: + or.. maybe there is a direct solution or maybe my whole theory is completely wrong and the problem is elsewhere, I have never owned an electric instrument.

I'm gonna guess its mono, you can loko at the 1/8" male jack. If it has two black rings, its stereo, if it has only 1, it will be mono. STEREO: MONO:

Make sure its a mono to stereo adaptor.