96 dodge caravan w/infinity

the guy i install for attempted to install a new pioneer head unit in a 1996 dodge caravan with the infinity system, now.... when you turn the radio up about half way all the sound cuts out. i didnt actually see what he did exactly, supposedly he used the factory ground behind the radio for the new head unit. any ideas what the problem could be? should you be able to feed hi level from a new radio into the infinity system without any problems? he also tried using a scosche FAI-3 without any success. the car already came back once when he tried installing the fai-3 so i highly doubt the customer will be returning a third time, so im just curious to find out for myself on this one.Mike Battaglia

Specialized Car Audio

Bensenville IL 60106

Did u try another deck first?that would rule that out.  i would break out the multimeter next see what the volts are when cutting out.   hard to trouble shoot so far away!rottenbellys 05 crew cab colorado.Pioneer dehp 880prs, kenwood excelon in all 4 doors. Bazooka 500 mono Jl 10w3 in coustom center console box.

yeah i dont think ill be having the honors of troubleshooting this one. i was just wondering if there is anything funky with the infinity systems in these vans for future refrenceMike Battaglia

Specialized Car Audio

Bensenville IL 60106