New and Improved Vehicles

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   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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Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 42022	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Topic: New and Improved Vehicles Posted: 10 hours 21 minutes ago 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 .
	Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.

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DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 34308	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 2 hours 58 minutes ago at 12:04am
	This more recent line of Hi-Tech garbage is not our friend. Been seeing this expanding over the last ten to fifteen years.