l.o.c. trouble... destroyed my stock system

[avalanche1]

I have a 2009 chevy avalanche with an upgraded factory bose sound system with screen. I had two 18" pile subs running off a lanzar amp installed straight into the stock amp with the loc. i upgraded to 3 12" kicker l5s off a zx 1500.1 stinger wiring kit to the loc on my bose amp. after they were installed i turned on my car and only one of my speakers in my car was working. After going to the dealership they were covered under warranty and fixed. but they blamed the subs. i re install the loc to my bose amp and the exact same thing happened again same speakers and everything. the dealership ordered a new amp and the 3 speakers. i took it to the dealership and they fixed it again and blamed the subs but when i took my car to 2 different car shops to get a second opinion they said all the wiring was correct and i shouldnt have a problem. every time the subs were installed they were done professionally by a company that is well known around my area (pittsburgh pa) as a legit place. i dont know what to do and was wondering if any1 can help find what could be the problem or why this has been happening and what to do...

ps.. every time the speakers were blown after the subs didnt play music because of the fried amp but they are on, (lights on compasitor and amp) the wiring was check multiple times and it was all done correctly... nothing touching, backwards, crossed, nothing......I am xtremely frustrated with the situation because there has been alot of wasted money involved so please help me out...

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[Shinju 10+ year member]

What LoC are you using? I used the JL Audio Clean Sweep in my Audi S4 with bose factory and never had any issues.

 

[Horsemanwill 10+ year member]

what loc what size wires give a complete break down of whats in ur vehicle