What are these parts ('87 300TD)

[TerryS]

I have not been able to get an answer thus far on identifying these two parts.
The first one is a plug with various resistors inside. Pulling the plug out and changing it's reference number changes the resistor to another value. I am guessing, knowing very little about my new Benz, that it may have something to do with the glow plug time delay, but that's just a stab in the dark. It is located just forwardd of the brake MC & booster.
The second part is a high wattage ceramic resistor. It's burned out and I need to know what to ask for, but, what circuit is it in? It is located just behind the left headlamp.
As always, your help is appreciated.