Sgrist,
It sounds like a high resistance connection like Jim said. What happens is that 12 volts will get thru the bad connection when there is no or little current flowing. But as soon as the contacts close on the GP relay, a high current tries to flow thru the bad connection and all the voltage is droped across the connection. Thus the contacts which are magnetically closed pop open. 12 volts are again available and the contacts close again. This go on and on and is the buzzing you hear. Sometimes the starter solonoid will do the same thing.
Buy an electronic multimeter. They are a very handy tool for the car and home.
P E H
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