charging system

[BLZNBIG]

ok heres the problem. i have gottn the battery tested and i put a new alt in it. but some how when i drive it it charges fine. but as soon as i shut it off it wont start back up.. every connection is tight. 1990 chevy 350 tbi

[Bo Duke]

check all your grounds, including the straps that go from the engine block to the frame and from the batter to the frame, and check both ends.......

[BLZNBIG]

i was thinking it was the grounds but i just wanted someone elses opinion also when i actualy use the blinker the alt gauge goes from where  ever its at to 0 and back up with every blink

[Bo Duke]

could be a short some were maybe........

[BLZNBIG]

well it does it with everything lights blinkers fog lights off road lights it dont matter what i use even the heater and stero

[BLZNBIG]

alright ill check that stuff out .. the  neg is to the motor and then the ground is to the fender. ill run another one to the frame and a bigger one to the body.. should i also ground the body to the frame even if i have the battery to the body and the frame??

[Hammerlane]

do you have a voltage guage or an idiot light?