First check the battery. I am cursed with being a victim of circumstances. I fix something, put it back together and something else fails at the same time, but I blame it on what I just did...
425 does not have a robust electrical. How man lights did you put on? Are you sure they are 35 and not 55 (more of a common wattage). Given that it died while running I am thinking that you might have a wire come loose, the alternator has stopped charging, or you burned up a lead.
When I did my lights, I pulled the dash. When I bolted the dash back in I pinched a wire. My machine has a circuit breaker so it pops the system so nothing bad happened but it was frustrating trying to track it down.
When I put in my lights, i went with a relay as I was unsure that the ignition had the guts to survive the amperage I was pulling...