I recently went through GP nitemare. Replaced a few a year ago and presumed they were good. Finally decided to check them, and 4 of 5 were dead, 2 of which were replaced a year ago.

The one good one was a German Bosch, Im almost sure, never been replaced in 26yrs. I replaced the other 4, with after market, because I needed to use car today, but next replacement will be BOSCH.

My lite always came on, not too familiar with how it works exactly, I think the old GP's were wired in series? so if one went out lite did not come on. Mine are wired in parallel so if one dies the lite still comes on.

However, now I come to think of it, before I chaned the glowplugs, the lite came on solid, then after a few minutes started blinking, now it starts blinking right off.

Anyone? Comments??? Thanks.