Farm Equipment - 7040 Alternator light flashing

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7040 Alternator light flashing

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=30384
Printed Date: 06 Mar 2025 at 8:06am
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Topic: 7040 Alternator light flashing

Posted By: jah72577
Subject: 7040 Alternator light flashing
Date Posted: 07 May 2011 at 7:57pm

I just bought a 1975 7040 with power director after I started using it the alternator or "Gen" light started flickering. Sometimes I can hear a faint click from behind the dash when it does it too. It progressively got more frequent and then my batteries were dead when I when to start it. So today got a new alternator and put it in. Got it running and everything seemed fine, no flickering light and the batteries were charging up. Untill a couple hours later it started flickering again! It tends to flicker more often and more brightly when the engine is running fast. Any ideas? I need some advice.

Thanks

Replies:

Posted By: MACK
Date Posted: 07 May 2011 at 10:17pm

Bad connection in wiring. Is the new alt still charging? MACK

Posted By: jah72577
Date Posted: 08 May 2011 at 1:55am

I guess its charging, the batteries where not dead when I was donw. How would I know? Which wire?

Posted By: jah72577
Date Posted: 08 May 2011 at 3:00am

Found out the batteries are draining overnite while it is sitting.

Posted By: MACK
Date Posted: 08 May 2011 at 6:11am

New alt may be bad. Hook a volt gauge to the big post on back of alt, should show 13.5+ volts running. MACK