hi. i was wondering if anybody can help . i have a 90? l 1300 skid loader made by prime mover. a co that went out of business. my problem is a lightning volt light that blinks . i start the machine and the light goes out but after it runs for about 20 seconds it starts to blink. i replaced the alternator and the battery is good . can anyone tell me what else this could be or how to test to make sure all is working OK. if i have a battery charger on the battery and i start the machine the light will stay on solid. any advice would be appreciated thanks .