I have cummins ISX 600 when i am on a pull i have a loss of voltage goes from 13.5-14 to 12 only on a pull. at idle or just high RPM it stays at 13.5-14 volts. could this be the timing actuators. thanks
thanks but i have 4 new optima yellow top batteries put in about 4 months ago. cables are real clean. but it is worth a try i will take them apart and check them.