well,

as an update I replaced the battery as it was bad and also replaced glow plug #5 behind the oil filter housing. I realized that I had previously changed plugs 1-4 to the newer BOSCH style adn that #5 was an older glow plug. Now all 5 are form the kit I bought from fastlane which came with the new relay.

No problems yet, so that may be the problem...either defective or mismatched glow plug

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1) 84 300SD 285K+ Miles (Ver Calif)
2) 84 300SD 175K+ Miles (Ver Federal)