Putting your Sprinter details in a 'signature' that appears in each post you make would be of great assistance to anyone reading your posts and might make diagnosis/solution of the problem more accurate.Ok thanks!
I think my controller might be the issue.
I worked in El Segundo, CA & used the following for my Gas MBZ. Because many MBZ’s are Diesel, I would think they could help on your Sprinter Glow-Plugs. Give them a call.Thank You. I wish we had someone that would install them in SoCal for that amount.