96 gmc yukon or any 96 to 99 gm fullsize truck or suv

[YA*AM*A*HEAD]

well i got my 96 yokon 350 vortec a few years back ....when i got it i was told the cruise controll works sometimes and the trans was shifting funney ,,,found out the trans was the troq converter not locking up ...so i have ran my own switch to manually lock it up ...my the cruise will just shut off out the blue and not work for a few minuites or a few day depends on how the truck feels ( i was told about the brake light switch but didnt solve the problem),,,i was told it started after having the flowmasters put on it...but now i blew the heater controll switch 150 dollars for a used on and i am blowing radios like crazy ...they work for mabe 5 minuites to 30 minuites and than no sound .gone threw 4 stock radios one sony and one jvc .and sometimes the trans shifts smooth from first to second and sometimes it shifts so hard i think the rear diff is gonna explode ....i am at my wits end and ready to give up ....i have been thinking about all this for years now and all i can figure is mabe i got a bad ground somewere from the back serge from them welding the flomasters on it ....has anyone had any of these problems on any gm fullsize from 96 to 99 2000 ish are suppost to be the same setup ...

[sinisterboo]

never in my entire life have a heard of weldig mufflers on causing anything like that. Muffler shops do it all day everyday without dissconnecting batteries. You need to look for chewed up wire or something.

[AKheathen]

it's always a posibility.....when using more current than you would ever need to simply weld a muffler......that aside, you normally only blow the heater controll because the blower motor is dragging down and pulling too much current. now, your whole system is databus conntrolled, which includes the radio, tranny and powertrain modules body, and abs. don't ask why they put a moduole on the transmition or the powertrain next to the radiator, but the wiring can be suseptible to te increased heat off the exhaust, not to mention slag damage burning a wire or 2.... may be behind the dash too. it sounds like a speaker wire could be shorting on something. definately reconnect the wire to the lockup solenoid; it's used for braking the engine between upshifts as well as locking up in overdrive. usually a problem there woud be not disengaging after a while being locked up, and also will disengage simotaneously when the egr activates to assist in exhaust cooling, having nothing to do with the lockup circuit itself. you really need to have it read by a techII or similar and look for event codes to get you closer. did the radio thing start around the same time as the heater? if so, those 2 are separate from the other problems and would totally change where to look for the issue.......