ON THE 1988 GMC SURBURBAN 6.2 DIESEL.WHEN I TURN ON THE IGNITION SWITCH THER IS A CLICKING IN THE DASH BOARD AND THE POWER GOES ON AND OFF LIKE THERE IS A BAD RELAY
you need a NEW battery...five is it with these modern tin/antimony ones...then clean the end of the black cable that attaches to the frame with a coarse wirebrush...bolt it back together with your new battery and you'll be good to go~
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