engine cranks very slow when hot

GMC
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LGAKI
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I have a 1985 GMC Sierra K3500 dump truck, it has a rebuilt 350 engine 5.7 litters, automatic transmission and has four wheel drive. The truck starts right up when it is cold but after I drive it for 5-10 minutes and try to start it it cranks very slow like the battery is drained and is very hard to start. If I try to charge the battery it says its fully charged. I have replaced the starter solenoid and cleaned all the battery connections. Do you have any other suggestion??
Aug 19, 2007 at 9:16 AM
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MIKE H R
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my next door neibor had the same problem, with the engine rebuilt the started could not turn it over when hot. He replace it with a high torque starte and ended his problems. The present starter could be week or not operating correctly.
Jan 17, 2008 at 1:37 PM
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