Problem with my V8 conversion Blazer, any mechanics?

[80INCHES 5,000+ posts]

1988 s-10 blazer with a 350 chevy TPI in it. Will only start when I have a battery charger or cables on it. It has an optima yellowtop under the hood a battery isolator and another yellowtop in the back. I disconnected the back battery to get as much juice in the front as possible. When I crank the ignition, the voltage drops, and the starter doesn't have enough juice to kick it over. The starter is from a newer Corvette. I'm convinced its the battery, my father dissagrees and thinks its the starter. Any ideas or suggestions before I go buy another battery?

hmm if u tried to put a new batt in there and it didnt work..and if its not the starter ...check to see if the crank shaft sensor or crank shaft position sensor is going..i had the same problem, it wont hurt to try it out.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

80

 

[NeverEnuffBass 10+ year member]

and stock chevy starter pulls 125amps give or take. a bad chevy starter pulls 600plus. wouldexplain the need for jumper cables

I'll have to check it out, worse comes to worse I have to pull it, its gonna be a *****.

 

[Silver 10+ year member]

when u start it w/o jumper cables. do u get clicking of the starter solenoid or anything?

 

[NeverEnuffBass 10+ year member]

Turned out to be that the starter fell apart. Thanks for everyone's help.

 

[80INCHES 5,000+ posts]

u gotta be shittin me

80

 

[NeverEnuffBass 10+ year member]

u gotta be shittin me
80

It was a pain in the *** to get in too