Possibly Alt Issues
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Senior Member
Joined: May 2018
Posts: 1,500
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From: Charleston, SC
Possibly Alt Issues
So today coming into work the screen was flashing codes about....everything.
2020 Ford F150 V6 Raptor
Aftermarket Battery under the hood XS Power
Aftermarket Lithium Headway Battery in bed for a year
Aftermarket Alternator Mechman 370
No ISO between batteries
About four days ago I got a Vehicle Charging System Fault, AC fan would should off lights went off and then came back on. My 2H light came on then went off as well. This happened a few times. So I checked the battery with a multimeter and resting voltage was good after sitting overnight. Then started the truck and checked and it was dropping .01 volt every second. So my initial thought was the ALT is shot. I unplugged the smart charge at the negative terminal and the alt kicked in and the voltages started coming up. I left that unplugged to monitor the system. Today coming into work i was dropping power to the ac and stereo constantly as faults for the charging system, auto start stop and it seemed so many other things were flying across the cluster. I never lost power to the truck. Maybe the ALT is really bad. Any thoughts?
2020 Ford F150 V6 Raptor
Aftermarket Battery under the hood XS Power
Aftermarket Lithium Headway Battery in bed for a year
Aftermarket Alternator Mechman 370
No ISO between batteries
About four days ago I got a Vehicle Charging System Fault, AC fan would should off lights went off and then came back on. My 2H light came on then went off as well. This happened a few times. So I checked the battery with a multimeter and resting voltage was good after sitting overnight. Then started the truck and checked and it was dropping .01 volt every second. So my initial thought was the ALT is shot. I unplugged the smart charge at the negative terminal and the alt kicked in and the voltages started coming up. I left that unplugged to monitor the system. Today coming into work i was dropping power to the ac and stereo constantly as faults for the charging system, auto start stop and it seemed so many other things were flying across the cluster. I never lost power to the truck. Maybe the ALT is really bad. Any thoughts?