Hope someone can help. I have a 1992 Defender 110 CSW and have recently had issues with it failing to turn over (ignition switch to start and nothing happens) when ambient temps are cool (sitting in the shade and air temp is 23C or cooler). As soon as sun shines on it and warms up, turns over like a champ. I have replaced starter/solenoid, starter relay, battery, ignition switch and I am now thoroughly confused. Any suggestions?