I am always interested in having things work as the factory designed it to.
I do not do work arounds or shortcuts or ditching factory engineering.
Unless it is a true improvement.

But I am getting a lot older now and tired of chasing down some problems.

My glow plug light went from intermittent to not coming on.
(working in warmer weather, but not cold...etc,,etc..)

I put 12 volts to the dashboard glow plug light harness wire
at the relay and got a good light (so bulb is good, and ground at the dashbaord is ok).

I jumped a small wire from glow plug harness to cabin harness.
Now I get a glow plug light that at least tells me that the glow plugs are getting 12 volts.

The relay is factory new.
Could never understand why the glow plug light was so touchy.
I have considered replacing both the harness from relay to glow plugs, and the harness from relay to cabin.
Soon as I get a chance I will replace these.

Anyway, the down side is the new method means the light does not go off
(it no longer is a glow plug timer).
But the upside is it will be a reminder to wait 30 seconds or more before starting. Longer when it gets cold.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250