Glow Plug Relay Question

[anhydrous7]

Approximately 4 months ago, I purchased the relay and glow plug kit from Phil and installed the components on my 1982 300SD. Prior to changing out the relay box, my glow plug light would come on every time during the glow cycle. Now that I have installed the new kit, with the new relay, I only get the glow plug light to illuminate every other time or every second time. I have observed this under many different scenarios: cold start, warm start, restart after 15 minutes or so, over night cold start. I cant figure it out. I have thrown a voltmeter on at various times and I have always read proper voltage at the glow plugs whenever I have done this.

I called Phil and he suggested I post this question on the forum. I have done several searches and have not found this identical problem out there.

Does anyone have a similar experience, or any knowledge on this problem?

I am starting to wonder if the relay box is suspect. I believe this new relay box has a feature built into it that fires the glow plugs even after the engine has been started for 120 seconds or so. I would not think this would cause the glow plug indicator light not to illuminate or be related in anyway to this problem.

Rob