I just added a 10ohm 10watt resistor to the newer style glow plug relay. Upped the ON time from 9-10 seconds to 22 seconds. You solder in the resistor to the C pin on the controller. On my 86 this was the yellow wire. My 6.2 has some miles on her and tends to not like 40 degree and under temperatures. Fires up great with the block heater pluged in, but my lazy ass forgets to plug it in alot of the time. Just thought I would pass on this tip. Also you would need to have the better AC60g glow plugs or some other self limiting glow plug. The 9g or 11g will most likely not appreciate the extended ON time and burn out or worse, swell up.