probably you have a broken Kapton flexcable
http://www.gerry-mobilfunk.de/cgi-bi...andy&sk=GM&sa=
Wikipedia : "However, it was soon found to have very poor resistance to mechanical wear, mainly abrasion within cable harnesses due to aircraft movement. Many aircraft models have had to undergo extensive rewiring modifications, sometimes completely replacing all the Kapton-insulated wiring, because of short circuits caused by the faulty insulation"