Forscan Side Effects? Disabling Auto Stop_Start
02-11-2019, 06:56 PM
#12
Senior Member
With BMS active it gets to “know” the battery over time and remembers charging times and loads as the battery weakens. When you install a new battery you have to reset the system to clear out the old memory and start fresh with the new battery or you could very well have issues. Not an issue when you have it disabled.
02-11-2019, 06:59 PM
#13
Senior Member
Thread Starter
Yes basically it controls a fancy voltage regulator. The difference from this to an old school voltage regulator is that the old ones could only regulate output to not go over a certain voltage this system can control over and under and off if it deams appropriate. This in effect removes the load from the alternator so it just becomes a free spinning pulley reducing engine load. There are two systems, the BMS controls what I described and is what we turn off. Then you have the battery save system that cuts power to everything if you leave the lights or an accessory on to save enough power to allow the battery to start the engine. This is common on most modern vehicles and what most people are familiar with. This remains unchanged.
02-11-2019, 07:01 PM
#14
Senior Member
02-11-2019, 07:13 PM
#16
Senior Member
Thank you. I think this is my last relevant question. If I make this change what , if anything, would Ford say about it? I have read all about the Maga_Ferg Act etc., but if I disable Auto S_S and leave it that way when I take it in for any service, what is the downside, if any?
However if you were really worried about it you can always take a couple minutes and return it to normal before taking it in. Anything you do with Forscan is easily reversible.
02-11-2019, 07:24 PM
#17
Senior Member
I also have a 2018 Grand Cherokee with *** and a lot of those guys are doing the exact same thing to disable it. They are pulling the fuse for the battery monitoring. They get a small warning light on their dash though. Sucks.
02-11-2019, 08:28 PM
#18
Senior Member
Turned mine off about 6 months ago and ZERO problems. Only thing that changed was no longer getting message that system is shutting down to save the battery. That happened before when truck wasn't running but was listening to the stereo for a SHORT time period. Now it's fine and haven't had any issues... no warning light in the dash either.
02-12-2019, 03:34 AM
#19
Senior Member
Thread Starter
I think that I have decided to go with this. It requires no change to program and still allows Auto Stop Start to be used if desired. Downside is it cost $90 and you have to take a chance on breaking trim pieces to install it.
AutoStop Eliminator
Any thoughts / comments?
AutoStop Eliminator
Any thoughts / comments?
Last edited by tperk100; 02-12-2019 at 05:52 AM.
02-12-2019, 05:41 AM
#20
Senior Member
Soooo if the alternator is basically a free spinning pulley (when shut off by the BMS) and the battery has been disconnected from the system......what is providing electrical power to the car?
