2012 Prius V wagon. 354k - Replaced passenger side headlight bulb with 100w H11 generic from Amazon. - Bulb soon failed with evidence of burning around base, as well as "welding" itself to connector. - Mechanic had to replace connector by splicing and crimping into existing wiring harness. - Car now will occasionally throw a bunch of lights on dash. Scan for code, no code stored. Clear code anyways to turn off extra lights on dash. - Car will also now turn off ECO mode, which I always leave on. In short, I know my car and how it normally operates. Is it reasonable to conclude given the electrical systems in a Prius V, that any electrical modification will cause all kinds of potential related chaos? I'm guessing, yes! - Had a similar issue recently with spliced wires for an aftermarket fan. What a nightmare. Issue solved when replaced with OEM. - In other words, these cars are highly sensitive to splicing of wires. I'm convinced that my only solution is to replace entire headlight wiring harness with the OEM part. Thought/opinions are welcomed. Thank you!
There are led bulbs with built in filters and there are plug in filters as well. The splices on those circuits (eg non-comm) are not the issue.
I would examine the mechanics work first. The wires are of a very small gauge. If he or she used crimped connectors the connector may have high resistance and causes a fault and a voltage drop. In this case, solder connections covered with heat shrink tubing is a much better long lasting option.
