i replaced the glow plugs in my 300D with the standard ones with a wire loop. the ones i took out were the pencil type. all are wired in series. now there is no glow plug indicator light and it won't start. why?
i can put the old ones back in, it will start, but i thought this would improve starting for the winter.

You need to get a NEW set of the style you took out. The loop type are not what you want.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

The loop type are not designed for your glow system. The glow elements are insulated from the block and ground buy completing a circuit to the consecutive glow plugs and a ground strap attached to the first glow plug. They also use resistor wires between glow plugs. The pencil style are designed for 12v each and only require a single connection each as they ground to the block. The two are not interchangeable.

ok, thanks. i thought i had the correct plugs. i see how they are connected now.