flashing alternator light 90 Corvette

It flashes when engine is warm. It is intermitant. Belt and tensioner OK, new powermaster alternator. I am guessing a loose wire (ground). Any thoughts? Where to start? Thanks Jack
 
theres three separate engine ground straps, on a bolt, on the rear of the drivers side cylinder head,near the fire-wall that can cause problems with the dash lights and gauges if loose, but obviously youll want to use a voltage meter to verify the alternator, and its voltage regulator voltage output and battery condition,before chasing loose grounds

http://garage.grumpysperformance.co...that-some-guys-don-t-look-at-the-clues.11176/

http://www.jegs.com/p/Powermaster/Powermaster-GM-CS144-Style-Alternators/1534945/10002/-1

 
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