Funky Wiring Issue --- Help A Noob?

[SlidewaysPOS13]

Hey everyone, I'm having what appears to be a dash harness crisis.

Here's the scoop:

My wiper blades will not work on the LOW setting with the headlights on. With the headlights off, my wipers work on all settings, no problem. If I turn the wipers on LOW, then turn my headlights on, the wipers stop working.

Also, I have no radio. I should, but it's not working. It's an aftermarket one. The previous owner hardwired it in, which is ghetto. My friend, who works on radios and wiring a lot took it out and made an adapter harness. When we plug the harness/radio in, not only does the radio not work, but my wipers act up. They sometimes came on when we pressed the radio power button. Also, with it plugged in, the wipers wipe 3-4 times when the key is turned to accessories. They do not do this when the radio is unplugged.

My cluster clock and dome light does not work either. Oh, and the little chime that's supposed to ring with the door open and key in the ignition doesn't ring.

We cannot see anything blatantly wrong here, which I figured would be the issue.

My friend says the fuses are fine, but I suspect he's wrong.

Can anyone point me in the right direction? It's driving me crazy!