A PA34 pilot reported an electrical system problem before engine start. With an FBO assisting the engines started and the electrical appeared normal. After takeoff the electrical system failed preventing gear retraction. Upon return to the airport a wing and propeller struck the runway.

Narrative

Performed thorough pre-flight exterior; wheels; engine oil check and fuel sump; walk around; etc. and then thorough interior check was done. After start of left engine; there seems to be no electrical power to the starter to start the right engine. Checked all the switches and tried again; still no electrical power. Shut off left engine and switched everything to OFF position and talked to FBO regarding problem and requested help and their power cart. A connection was made via vehicle battery and jumper cable to the aircraft's external power plug. As soon as connection was made and the battery switch was turned to ON position; power was restored. Both engines started with the right engine taking few more attempts. External connection was disconnected and amp meters were showing positive charge. A check of all switches and instruments was performed. RPM was increased to 1500 and kept there for several minutes. Alternators seem to work fine and the amp meter show normal range. All electrical switches were checked again and made sure all were in proper position. Taxi was done and all run-up functions were performed and checked thoroughly with all engine instrument gauges showing green; and all electrical systems/switches were checked again. Rolled out onto the runway and rotated at about 85 KTS. Established climb and performed gear up. As soon as the gear up lever was moved up; all electrical power including both GPS went out. Gear up red light in the enunciator panel was momentarily seen and was gone. Climb was difficult and there was an unusual sound out of the right engine/prop and a pull of the aircraft to the right. My thought process was:1) Gear up function was not completed; therefore lots of drag. 2) Electrical problems. 3) Possible right engine failure. Prop lever was brought back a little and the noise level decreased and a decision was made to turn back to the airport. A right turn was made and ended up on the right side of the runway. A call was made to traffic not knowing whether I had radios or not; but I had runway insight and there was no aircraft on the runway. Landed and right wing tip and propellers slightly touched the ground.