THIS WAS DEFINITELY A POOR CHOICE FOR A "GET AWAY CAR" AT THE BANK!
I WAS WAITING FOR YOU TO GET "ESTABLISHED" WITH ANOTHER EXPERT, BEFORE I THREW IN MY ANSWER.....I DO NOT KNOW YOUR SPECIFIC VEHICLE, I'M MORE IN TUNE WITH OLDER, PRE-COMPUTER VEHICLES......MAINLY JEEP CJs AND OLDER FORDS
WHAT CAUGHT MY ATTENTION WAS THE "WHIZZING" NOISE YOU ARE HEARING ALONG WITH THE OTHER ELECTRICAL ISSUES....I WONDER IF THE SOUND, SOUNDS LIKE, TURNING YOUR KEY TO "START", WHILE THE ENGINE IS ALREADY RUNNING???
THEY ARE CRAMMING MORE AND MORE STUFF INTO SMALLER PLACES....PRETTY MUCH, JUST ABOUT ALL OF IT IS TOUCHING/ NEARLY TOUCHING SOMETHING ELSE
"S WIRE" (ON VEHICLES I'M FAMILIAR WITH) IS THE WIRE THAT ACTIVATES THE STARTER WHEN THE KEY IS TURNED....IT TRAVELS THRU SEVERAL SAFETY'S AND SUCH BEFORE IT REACHES THE STARTER.
ALONG THE WAY, OR EVEN WHEN IT ARRIVES AT THE STARTER, THE WIRE BE BARE, AND IT POSSIBLY/ INTERMITTENTLY TOUCHING SOMETHING SOMETHING THAT IS "FULL TIME 12V".....THIS SCENARIO WOULD ACTIVATE THE STARTER OWN IT'S OWN, WITHOUT EVEN TOUCHING THE KEY
ON STARTERS SUCH AS OLDER CHEVYS (LIKE SOME NEWER CARS) THE BATTERY AND ELECTRICAL FEEDS COME OFF OF THE "HARD TO GET TO" STARTER, THE WIRES ARE SO "GENEROUSLY" SHORT, YOU MUST INSTALL THEM IN A HARD TO SEE/ TIGHT SPOT, I HAVE SEEN THE RINGS INSTALLED ON THE WRONG POSTS (USUALLY FIGGERED OUT IMMEDIATELY)
FORD/ CJs....DO ALL OF "STARTING" AND "FEEDING THE ELECTRICAL SYSTEM" FROM UP ON THE FENDER OR FIREWALL, USING A REMOTE STARTER SOLENOID.....ONLY ONE BIG CABLE GOES DOWN TO THE STARTER......I LIKE 'EM!!!
....ON THE CHEVY TYPE SET UP
BASICALLY RING TERMINALS THAT NUTS HOLD ONTO STUDS, IF THE RING IS SET PERFECTLY ON THE STUD, CARELESSNESS IN TIGHTENING THE NUT SOMETIMES ALLOWS THE RING TERMINAL TO "TWIST" AND TOUCH/ GET NEAR THE NEXT NEARBY ELECTRIC STUD.
THESE ARE JUST SOME THOUGHTS, I THINK THAT EVERYBODY SHOULD, AT MINIMUM, HAVE ANY AND EVERY OPTION OR POSSIBILITY PRESENTED TO THEM (RIGHT OR WRONG)
AS FAR AS CHECKING CONNECTIONS---LOOK THIS OVER
https://www.2carpros.com/questions/1996-chevrolet-tahoe-wont-start-sounds-dead-battery-jumpbox-get-same-reults
IF THE WHIZZING IS NOT THE STARTER....IT WOULD BE NICE IF YOU HAD THE HOOD OPEN AND COULD AT LEAST PIN DOWN ABOUT THE AREA WHERE THE RACKET IS ORIGINATING FROM...IF POSSIBLE!
KEEP US POSTED
THE MEDIC
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Thursday, August 6th, 2020 AT 9:38 AM
(Merged)