I learned from the 6.2/6.5 Diesel Troubleshooting & Repair Guide that AC9G glow plugs should be replaced as soon as possible because of the possibility of distortion and potential problems if the plugs can't be extracted in one piece. I checked my 1984 G2500 van camper and found AC9G glow plugs installed! The 6.2/6.5 Diesel Troubleshooting & Repair Guide article said to upgrade AC9G's with AC60G's but I've read several references elsewhere on the internet that alude to starting problems with the AC60G's because the glow plug controller doesn't keep them on long enough. There were some references to the need to modify the glow plug circuit by installing a 10 ohm resistor somewhere to lengthen the on time.
On the Kennedy web page I see they make a reference to starting problems with AC60G's and sell an "instant" glow plug that's claimed to work better and not distort. There isn't any reference to glow plug controller modifications.
Does anyone have any experience with cold starting problems with AC60G plugs or any comment on controller modifications?