http://www.husqvarna.com/ddoc/HUSO/HUSO2012_NAen/HUSO2012_NAen_LGT2554_532432908R5.pdf Hands on, inspect wiring harness, all switches, relays, unplug one by one, inspect contacts if o.k. re-plug one by one, look for bare wires, burn spots, make sure everything electrical is tight and secure including ground cables & straps. Test starter solenoid: