james cole
Well-Known Member
- Thread starter
- #1
Hello guys…
I did some forscan mods non related to BMS and after that the voltage reading is at a steady 14.5V even after charging the battery and a long trip, car is a 2022 Mach 1 with about 1,000 miles.
The voltage is supposed to drop for efficiency but I can seem to get it to work even after a BMS reset,
Anything else I should look out for?
Thanks!
JC
********UPDATE MADE IT WORK*********
OK, so in order to make the variable voltage from the alternator work, you need to do the following after swapping the battery, changing battery type in forscan or making a bms reset.
1. Leave it for at least 10 hours fully locked and charged
2. Reset PCM, resetting PCM without making the car go to sleep for 10 hours wont work... after this it should immediately work .
Reason is when monitoring BMS via forscan the Battery State Detection algorithm it requires around 10 hours to calculate the real state of charge of the battery, if it doesnt know it, the variable voltage will not work, it will default to 14.5 volts constant.
Why you need to reset PCM for it to start working is beyond me...
So I installed a AGM battery, modified the as built data from flooded battery to AGM, waited 10 hours, made a PCM reset and it works.
It was a bit of a pain to experiment and find this out, so I hope it really let's the engine make more power by freeing the alternator.
I did some forscan mods non related to BMS and after that the voltage reading is at a steady 14.5V even after charging the battery and a long trip, car is a 2022 Mach 1 with about 1,000 miles.
The voltage is supposed to drop for efficiency but I can seem to get it to work even after a BMS reset,
Anything else I should look out for?
Thanks!
JC
********UPDATE MADE IT WORK*********
OK, so in order to make the variable voltage from the alternator work, you need to do the following after swapping the battery, changing battery type in forscan or making a bms reset.
1. Leave it for at least 10 hours fully locked and charged
2. Reset PCM, resetting PCM without making the car go to sleep for 10 hours wont work... after this it should immediately work .
Reason is when monitoring BMS via forscan the Battery State Detection algorithm it requires around 10 hours to calculate the real state of charge of the battery, if it doesnt know it, the variable voltage will not work, it will default to 14.5 volts constant.
Why you need to reset PCM for it to start working is beyond me...
So I installed a AGM battery, modified the as built data from flooded battery to AGM, waited 10 hours, made a PCM reset and it works.
It was a bit of a pain to experiment and find this out, so I hope it really let's the engine make more power by freeing the alternator.
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