New and Improved Vehicles
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208679
Printed Date: 27 Oct 2025 at 12:02am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: New and Improved Vehicles
Posted By: Coke-in-MN
Subject: New and Improved Vehicles
Date Posted: 26 Oct 2025 at 4:41pm
So last year my 2015 Jeep Cherokee died one below Zero day - battery just stoned itself overnight . OR SO I THOUGHT - it seems little signs showed up over a couple years with some features not working in dash . Stop / Start and odd times of warning lights - original battery from 2015 until 2025 - yet battery voltage varied which created problems
Other day went to start my 2010 GMC work truck - battery lit dash lights but when turning key nothing . cycled key on and off a few times and it started then died .
Put charger on it to try to start , no go / Let charge a couple hours at 10 amps / Nothing
Changed battery with one I had in shop - engine started - died in about 10 seconds
Charged battery couple hours - same 10 second run . After charging overnight started next day but dash gauges fluttering on and off and rough running engine .
Checked output of alternator and was in 13 volt area
Took battery out of other plow truck (2000 GMC) installed and truck started but dash fluctuated on and off on instruments .
Seems the Alternator charge rate is set by the ECU now and unit has 4 wires - 2 to regulate and 2 to tell the ECU what to do about rest of charging system .
Seems if voltage is not high enough ECU shuts down the engine , if battery voltage is low it will not allow alternator output to rise so control engine or dash , radio or other accessories - battery charger with High Amp Start cycle will not overcome ECU .
So yesterday 2 new batteries as year old ones had internal problem - then after they were installed dash still flickered so new Alternator (160 Amp unit)and it runs , starts and gauges read steady .
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