overcharging 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=137516
Printed Date: 07 Jun 2025 at 12:26pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: overcharging alternator
Posted By: BKarpel
Subject: overcharging alternator
Date Posted: 18 Apr 2017 at 5:08pm
|
We have a 9170 Deutz Allis that we have been fighting charging problems for a few years. All of this started after the cab was pulled off to fix the rear end. The problem is that it charges around 14 and jumps to 16 and maxes the gauge out and jumps around. It cooks out batteries. When running at night the lights go bright and dim. The dealer is at a lost and doesn't know what to do. The tractor was is there this winter when it quit charging. A wire under the dash was burnt off. I was driving it there when the cab filled with smoke and it started charging. They have replaced the alternator about 4 times, key switch, ac blower, ac switch, batteries, cables, wire from key to alternator, pulleys, belts. They where able to get the alternator to start charging after the tractor is running and not rev to 1500 the last time but nothing else is right. We ran 80 acres since then and the batteries were bone dry and water ran out the bottoms when we filled them. We replaced them last fall. The only thing powered by batteries is a fuel pump, ac, gps, tool bar monitor, radio. We dont run much at night. The alternator has a 3 wire pigtail and a post for the battery cable. Can you explain the pigtail wires. I think one goes to the tach and one gets power from the key. The delaer was out today and they didnt find anything. We installed 2 new batteries and keep going! Im open for any help. Thanks Brandon
|
Replies:
Posted By: DougG
Date Posted: 18 Apr 2017 at 5:58pm
|
Hate to say this, but I bet it's a simple wire mash or connection somewhere,,, just my opinion
|
Posted By: LeonR2013
Date Posted: 18 Apr 2017 at 7:39pm
|
I've found in cases like this that it is in the grounds. Make sure of the ground from the batt. to frame, or however it is grounded. Run a ground from the ground post on the alt. to engine. Also run another ground from the cab to the frame. Look for any loose connections. Check for any corroded or rusted connections, even the light switch. This may give you a place to start. Let us know how it turns out.
|
Posted By: MACK
Date Posted: 18 Apr 2017 at 10:37pm
|
Doug and Leon are on the right track. You can not have too many ground wires. When cab is set back on, it is easy to mash a wire or leave a ground wire off. MACK
|
Posted By: DougS
Date Posted: 19 Apr 2017 at 4:25am
|
I have no idea of how that alternator is wired, but if it uses external sensing the sense wire could be intermittently shorting to the frame somewhere.
|
Posted By: BKarpel
Date Posted: 19 Apr 2017 at 8:20am
|
Thanks for the suggestions. Dad was disking last night and the tractor stopped moving. Think something from the engine to the transmission came apart. Motor runs and the transmission shifts through all gears. Dealer will have to get it on a trailer and tear into it. Wont get it back till done with field work. Im thinking the cab will have to be pulled off again. The worse part is the tractors rear end was pulled apart in 2009 for bad brakes that pushed metal shavings throughout the rear end. Too bad we put a new cooling fan and all new tires on it. Now we are down a tractor and ground working equipment. Our 25 foot disk is to big for the 1586 IH to pull. Going to try to find a field cultivator or rent/ buy a tractor.
|
Posted By: MACK
Date Posted: 19 Apr 2017 at 9:14pm
|
Sounds like it broke hub out of clutch. MACK
|
Posted By: DougG
Date Posted: 20 Apr 2017 at 9:05am
|
Dam that's bad luck,, hope it's not too expensive
|
|