Did you get pulled over on University tonight?

[A//// Guy]

Yea you can mess up alot more than just the ECU if you have aftermarket electronics wired into your system because they will be getting power from the ecu or wiring hooked up to the alternator but not from battery sources. My car has quite a few wires coming straight off the battery and I wouldnt pull those off with the car running.

Just have checker load test your battery and also check the alternator.