Glow Plugs and Turn Signals

[supercub]

I replaced the glow plugs in my 79 300D. I noticed that the interconnects glow a dull red until the timer shuts off. I had cleaned the connections, I doubt I have a bad connection. I put a light amount of copper anti seize grease on them, and the glow plug threads. Also I removed the in line fuse and cleaned the connections. Any ideas?
My signals fail to work every once in a while. I checked the fuses and I checked the signal switch for continuity. The connections look clean. When the signals were disfunctional, the hazard lights worked. Any ideas?

Thanks!

[Benz Dr.]

I've found that poor ground connections will cause all sorts of strange problems. Sometimes a mixed up wire will cause things to back feed which really creates very strange problems.
Check your grounds first then move on to other areas.

[supercub]

I believe that the flasher switch was partially engaged, and that disabled the signals. I pushed it in and out a cople of times and they are working. I will look for an engine ground. I did remove the glow plug ground cable and clean the terminals.

[supercub]

I checked the voltage across the glow plugs as outlined the Haynes manual. They state .75 to 1.25V. Cylinders #4 and 5 read 1V, but after that the series is dead.