[Elecraft] problem on low power module K2

[kurt wetter]

Help Needed
After using  the K2 for some time with the 100w module and putting back on the 15 watt module for a portable operation a problem occurred:
low batt indication, no power on transmit. with 13v ps. or with charged interne battery the same thing. but when the 100w module installed and powering with the low power 13 v jack i get the 15 w. out.
 wonder if anyone can help to resolve that problem ?

73 kurt