Radio Speaker Problem

[Man In Black]

I have a 68 Corvette with an aftermarket corvette radio ( I believe Auto Sound ) The cars radio was supposed to have worked but was disconnected when the dash was taken apart for other work to be done. I hooked everything back up and the radio plays good but the left side speakers ( front and rear green wires ) are the only ones that work. The right side speakers won't work at all. The right side speakers themselves are good because I pluged them on the left side and they work perfect. It seems that the ( purple right side wires ) are dead coming out of the amplifier. Are there any readings that I can take to see why there is no power in those wires ? Any help would be appreciated.

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