<!-- / icon and title --> <!-- message --> Replaced the isolator relay to the coach battery, old faulty relay used to run down chassis battery.

Isolator Relay Delay now works fine, but P1633 code keeps popping up.

Trying to trace wiring coming from Fuse Panel and PCM for any damage, looking for Power Distribution pages, local Ford dealership is having problems with their system and cannot bring it up.

Does anyone have Section 13-1 of wiring or a list of the colour coding for wiring?

Next, how do I measure voltage between the KAPWR and the PCM harness connector. If anyone has a diagram to refer to, that would be great.

Thanks.

 

If you isolate the battery from the Computer you are going to get this code.

 

The isolator only disconnects the coach battery from the chassis wiring when the motor is turned off.

The chassis battery is always connected to the system, that's where I get confused. The system never actually drops below that 5 or 9 volts, whatever it is, which should bring up the code.