2015 Ford Focus Not Charging
Replaced wiring for the ac compressor that got ripped apart from running over some heavy gauge wire on the road. Upon fixing that the vct solenoids and purge valve were setting codes. Alternating between fault and no fault. Think I resolved that issue but I put the car back together and now it won't charge. The splice in the LIN circuit was bad so I repaired that but still nothing. I've load tested the circuit with everything unplugged-all good. With everything plugged in I backprobe the LIN wire at the battery junction box and I have almost 9V. Still backprobing I put a test light on the circuit and it drops to .5V. Tried the same thing with the alternator unplugged and then the shutter actuator unplugged with the same results. It wass charging fine before. I need a little help so I can save what's left of my hair!
You need to voltage drop test the output wire and ground of the alternator. It should charge with the lin bus wire connector unplugged. You need a lab scope to check the lin bus at the alternator. Is the pcm setting codes for alternator communication, you may just have a bad alternator or a blown fuse to the alternator output.
Thanks for the reply. That's where I was headed but my brain won't accept that it just quit working overnight! I do have the loss of communication code for generator.
Well, if the scope shot of the LIN looks OK, the alternator is done.
Agree Should Charge Unplugged. Check To Make Sure Battery Terminal Fuse Has Been Grounded And Blown. Check Voltage Drop Power And Case Ground. If Both Are Fine And Reg. Is Unplugged Should Charge. On Connector For Reg. Pin 1 Should Show Battery Voltage Key On Running And Checked With A Lab Scope . Should Show The LIN Bus Pattern When Being Controlled By PCM. Connector Will Look To Have 3 Wires…