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The idea is to control the length of time the glow plug stays on after starting the engine. With the Di engine it is a bout 5 minutes. The aim of using the timer is to reduce this. Some people reduce it to about 30 sec after startup.
The first link has a lot of detail as well as the usual added trivia.
My suspicion is that the glow plug issue with the Di engine is part of the grenade issue. Nissan seem to have reduced the after start timing of the plugs with the CRD engine.
Also with any of the glow plugs the indications being they need to be physically checked about 80,000 Km after installing.
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