The stereo in my party bus keeps shutting down, or goes to protect mode and needs to be reset. I wired it myself without a harness,(couldn't get to the bus harness) but followed the wires/connections(that were clearly marked) from the old radio. My question is can each ground wire from all 4 speakers be tied together and then ground to the chassis with 1 wire, or does each speaker wire need to be ground separately? Could that be my problem? Or is there something else I need to address?Thanks

You should run all speaker ground wires separate. Is your unit overheating? Was there enough amperage for the new stereo to operate?

Most modern stereo's do not connect to ground.
Use a pair or speaker wires for each and you should be allright.