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Author	Topic: alt light on 1979
majik455 Gearhead Posts: 184 From: duluth ga usa Registered: Jan 2005	posted 01-26-2006 08:32 AM Man this crazy light is killing me . it blinks in flashes its on its off....but it charges? new alt new volt reg ????? Any clues ppl tHANKS Ron IP: Logged
Whitson Gearhead Posts: 110 From: Western Canada Registered: Dec 2005	posted 01-26-2006 10:53 PM Normally that happens when the alt. brushes wear down to the point they are just barely making contact. You might want to check for loose wires/connectors first, but you'll need to either replace the brushes or get a rebuilt alternator. IP: Logged
majik455 Gearhead Posts: 184 From: duluth ga usa Registered: Jan 2005	posted 01-27-2006 04:40 PM it has a new alt so ill star checking wiring.....any other possiblites? IP: Logged
MLariviere Moderator Posts: 4120 From: Biddeford,Me.USA Registered: May 99	posted 01-27-2006 08:51 PM I would check the voltage regulator and its harness carefully. IP: Logged
cookie_monster Journeyman Posts: 22 From: south, central, us Registered: Nov 2005	posted 01-27-2006 09:59 PM One of the best things I did on my old '79 was to replace the Motorcraft alt/reg with a Delco (sorry guys....) Alternator. Much easier to work with. I hate GM stuff. But, if they make 2 things that are worth anything, the alternators (well..the early ones anyway) and Powerglide transmissions aren't too shabby. IP: Logged
DidgeyTrucker Gearhead Posts: 1631 From: Greenbrier, TN USA Registered: Oct 99	posted 01-28-2006 09:40 PM Does it do it at idle? Is the idle speed too low? What is the voltage at the battery with the motor off and with the motor running? Should be 12.5v and 14v. Tracy IP: Logged
majik455 Gearhead Posts: 184 From: duluth ga usa Registered: Jan 2005	posted 01-29-2006 08:55 AM motor off ign on its on norm steady. running blinks on off steady or completely off totally random. took it to autozone they tested and said shes charging fine and I havent had the first sign of problem. IP: Logged
DidgeyTrucker Gearhead Posts: 1631 From: Greenbrier, TN USA Registered: Oct 99	posted 01-29-2006 12:21 PM It might be just a finicky regulator. Do you have the old one to put back on for a test? Tracy IP: Logged

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