Glad to hear you figured it out 300. I too have a problem it seems that the glow light on dash and cycle knocks off to soon under 10 sec. it seems the minute the temps. drop below 30 and the car has been sitting for 12 hrs. I have a bear of a time starting my 617 took me 20 min. other day with repeated shots of WD in the intake have been thinking about going with a manual glow of which some members have good write ups on only thing holding me back is I like the light on the dash as a somewhat indicator if all plugs are working or not. I do not think light on dash would work if I went to manual glow system. What I currently am doing is plugging car in any time temps. drop below 30 it even kicks right off at 3 below then. I do think these M.B. engines are just a bit more harder starting then say a cummings in cold weather call it the nature of the beast. If you do go to a manual glow a benfit would be only cycling it when needed for as long as needed thus lengthing the life of glow plug a real plus in your engine with them being so much harder to change then a 617.