Need a lil help with low voltage problem.

[craiglen]

I recently just bought a 79 k5 blazer and am having some problems with low voltage.When i start it in the drive way the voltage is fine but when i start driving it the voltage drops to 9 or 10.Ive replaced the alternator,cable from my batt. to the starter,cable from batt. to ground,small 2 wire connector on side of alternator, and nothing helped.Granted everything i replaced needed replacing but nothing helped my problem.Could it be a loose connection at my fuse block? I know its not a bad guage because when it drops everthing slows down like blower fan and my cd player just shuts off.Any help with this would be greatly appriciated.

 

[Jason4x4]

Make sure you have good body grounds.

 

[craiglen]

Thanks for the help Jason,you were right.there was supposed to be a ground from my core support to my battery that wasnt there.Put a ground strap on it now it works fine.Thanks again, this has been bugging me for a month.