Monsterfan2112

I just received a '72 Triumph Bass in excellent condition, that I purchased online. Upon plugging it in, I found there is VERY low output when switched to LO impedance, and NO output when switched to Hi. Am I missing something, or is something (possibly the switch itself) faulty? I just naturally assumed that ONE of the two settings would yield a fairly normal level signal. This is the first low impedance instrument I have owned. Can anyone help me out? Thanks! Mark