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crank but no start, no 'wait to start' light
please help, long time reader, first time poster
drove my truck several times yesterday, wouldnt start after shut off for 1 hour or so.
99 f550 SD 7.3
have since replaced the glow plug relay.
i have voltage from pcm power relay, small terminal on glow plug relay.
apparently no signal to close the relay from other small terminal.
i have voltage from battery to large termin. on relay.
i tested the relay with a jumper wire, and "forced" the glow plugs 'on' for 30 secs, still no start.
i installed a TW 6 pack 4 wks ago but have had no trouble until now.
could the TW chip have fried the PCM?