Thank you to all that responded to my other thread. After only one week of installation of new block heater it went bad, heater is testing open circuit. Truck starting in morning only by the grace of God, will be replace existing heater and while at it was going to put in a spare. If someone could tell me good location that would be great. Current heater is on left side just fwd or oil filter. 1985 Silverado 6.2. Thank you All. Dave