I have been having trouble this winter, since a cold snap six weeks ago, starting my benz. Now the glow light will not come on at all. And if it does it doesn't seem to heat the engine. My only recourse is to spray starting fluid in the intake (which I hate).
I have just performed a resistance check on the preglow system and found that plugs 2 and 4 show infinite resistance. If I replce these two plugs does anyone think this will solve my problem?

Paul Roberts