crank but no start, no 'wait to start' light

[99F550DUMP]

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?

[alabamafrog]

No wait to start light usually means the PCM has lost power or has fried. Make sure the fuel bowl heater didn't short out and blow the fuse that gives power to the computer. If thats good then try removing the chip, if the terminals on the computer were not cleaned really really good then it may not be happy. IF the computer is bad then you can get a new one for about $75 shipped, I just bought one last week from an online junk yard.

[99F550DUMP]

Originally Posted by alabamafrog

IF the computer is bad then you can get a new one for about $75 shipped, I just bought one last week from an online junk yard.

i unplugged the chip as soon as i noticed it wasnt going to start, where'd you get your pcm from?

[Diesel Monkey]

Unplug fuel heater, check fuses in box under hood (#22)?

[alabamafrog]

I think #22 fuse is the older PSD, I beleive the 99-03 is a differnt fuse, something like 30. Thats why I just said check the fuel heater and fuse cause I aint sure which one it is.
I think the website was Car-Part.com--Used Auto Parts Market

[99F550DUMP]

checked all fuses again, switched around relays, unplugged fuel heater.
no movement in tach or oil pres. when cranking.
---no luck---
PCM?
do i have to get a "year specific" PCM, if not, what model years will work?
is it plug and play, or will i need to get it reprogrammed?

thanks for your help , guys

[Marty]

Your tach being a 99 won't move while cranking.

Check your Fuel heater fuse - it's #28 or something close. It's a 30AMP fuse. That's usually the problem when the WTS light goes out

[Marty]

Your oil pressure should MOVE when cranking...

[alabamafrog]

I got a new computer for my early 99 from an online junk yard for $75 shipped. I got one from an 01 with code PMT1. I just put it in a couple days ago and she runs good, more power and the tranny shifts a lot better.

[99F550DUMP]

I've got a handshaker, is there a difference between that and an auto trans PCM?