Trace it out. A test light is perfect for this.
I would start at the light.
Verify the power at the pigtail drops off when the lights stop working. If it has power, i'd blame the bulbs. No power, work your way back to the relay.
With the relay in place, test for power on the 'output' pin. If it has power, there is a broken wire. No power, move on.
Pull the relay out. Test the signal, battery, and ground slots on the pigtail. Signal and battery should show power (12v). clip the battery to the positive side of the battery (or junction block) and test the ground. If all of these look correct, replace the relay. Otherwise, follow your way back to the headlight switch, battery connection, or ground.
For the headlight switch, test the output side of the switch to see if you have power there. If so, look for a broken wire. If not, might be a bad connection or bad switch.
Schematics:
http://outintheshop.com/faq/wiring/w...s/image002.jpg
http://outintheshop.com/faq/wiring/w...s/image003.jpg
Another thought is to switch the high / low relays.
Quote:
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Now on low beam all four are on.
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Sounds like something is not wired correctly. Would expect this on high, but not on low. Might the wires had gotten mixed up some where? Unfortunately, this can be hard to troubleshoot without being there and seeing how it is wired.