Nifty mod, I'm surprised it hasn't gotten more attention. Does this also work if you have afterglow by cutting the purple wire?

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CENSORED due to not family friendly words

Yup!

The mod tells a simple story: if there's power going to the plugs, the dash indicator will be dimly lit. So if you've started the car and are after-glowing, it will be dimly lit. And it would be a really good thing to know if you've done an after glow mod... because you'd want to see the indicator go OFF at some point... If it stays dimly lit... you'll be burning out your glow plugs sooner than you'd hoped.

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Cheers!
Scott McPhee

1987 300D