1999 chrysler lhs 116500 miles brand new battery and altenator... battery light comes on about 10 minutes after starting car and driving. Brand new battery checks out fine lights flicker on and off sometimes and radio sometimes goes out for a second... now car will not start but electricity works and will start with a jump... trying to diagnos the REAL problem because the mechanic that put in new battery and alternator doesn't seem to know what's wrong...