Thanks guys.. Can I connect to the factory amp input instead of the output? Shouldn't the input be a cleaner signal? I bought an alpine MRP-M350 amp. They show connecting to both the left and right speakers. Do you guys this this is necessary? In the troubleshooting section the say the low output can result from only using one of the line-level inputs. I always verify power, switching, and ground before connecting and I can validate the amp output with an extra speaker. If I can use the amp input, any ideas on how to verify that? I use to have access to an oscilloscope but not anymore.

Thanks Again
Bruce