Farm Equipment - 7040 Alternator

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7040 Alternator

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=7901
Printed Date: 18 Jan 2025 at 12:42pm
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Topic: 7040 Alternator

Posted By: archangel_cpj
Subject: 7040 Alternator
Date Posted: 10 Feb 2010 at 11:29am

I want to get a more powerful alternator for my 7040 do you think NAPA will have one Im assumind the 7040 has a 90 amp one there now I want over 100...

Replies:

Posted By: tbran
Date Posted: 10 Feb 2010 at 12:20pm

Neihoff is expensive but they go up and over 120 amp. Might keep tach working. If not can drill for pick up as 8000 uses to run tach. If you are using a bunch of amps, run a separate wire, #10 or 8 from main post to starter or positive on batt. Also the breakers and power straps on the firewall will need to be cleaned as they break down over the 30 years of use.

Posted By: archangel_cpj
Date Posted: 10 Feb 2010 at 5:28pm

ya I ran all new wires I cant get the old alternator to keep above 12.8 - 13 volts under a load and now the lights comin on it needs to be bumped up just gotta find one???

Posted By: Brian Jasper co. Ia
Date Posted: 10 Feb 2010 at 6:55pm

Before Ford and GM began offering dual alternators, ambulances usually had 175 amp Leece-Neville alternators on them. Might see if you can find an old ambulance in a junkyard and grab one. Older semi tractors often had them too.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: Dave King
Date Posted: 10 Feb 2010 at 7:05pm

When Dad had an air champ planters, he ran a 120 amp Neihoff to run the 3 blowers, but the longivity wasn't very good. If you could fit it for one of the bigger ones off a truck, I'd think that would be the ticket if you're using it hard.

Posted By: archangel_cpj
Date Posted: 10 Feb 2010 at 8:23pm

what is the amps on a 7040 alternator any how??? will the tach bolt be hard to find???