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Not even sure a test light would show the problem, if contacts on relay partially engaging light might go on, but it is a good start. To OP; you did check or replace the glow plugs? You should check them again at some point. Have seen cases where people with problems with system and manual...

Another thing to check; If the relay is bad or intermittent, you could also get a good voltage reading on voltmeter even if relay is not making full contact. Does not take much amps to register on no load test device, takes a lot more to run the glow plugs.

If the relay is bad, glow plugs will not work even with the button type actuation. One thing I have seen is the relay(or solenoid) actuates with button or stock system, and the contacts sometimes connect all the way, sometimes not. This kind of intermittent situation can be harder to...