I just noticed this post. It is a little old, but maybe someone is still reading it.
I have a 2005 Beaver Monterey Laguna IV with dim headlights. I decided to do the fix that was previously mentioned after our last trip. The funny thing is, I did not correlate it at first, for some reason my dash radio went out. Didn't think that much of it at first, just thought, oh great, something else to fix. The next day we started out and the radio was on. Okay, maybe a short. Then we were driving through some rain, turned on the headlights and the radio went off. Aha, the headlights are shorting out the radio.
A few days later I decided to dig into the dim headlight fix. It appears that it has all been done already. I guess by the previous owner. They didn't use the same relays as was mentioned in the instruction and the wires seem to be in the correct place on the power strips. High and Low beam on 5 and 4. Power wire connected to CB8.
So what would cause the radio to be turned on and off by turning on the and off the headlights.
Maybe they connected the wires to the relays wrong?