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its a b280. the number 15 terminal has 2 wires 1 that i traced back to the power stage and the other goes all the way to the FI ecu,...
That's where you're going off track. That's the EZK Ignition CU, not FI.
Ignition +12v comes to the coil #15 first, then goes to the EZK CU and the Power Stage on those 2 wires you traced.
With Key On, check wires at the Power Stage. Blue wire should have +12v, Brown wire should be ground. Other end of brown ground should be on the intake somewhere (along with another brown wire from the Ign. CU -- the one you thought was FI).
If voltage and ground are OK, the PS is probably shot. I think it runs hot, and depends on special heat-conducting mounting "grease" where it mounts to the inner fender. That stuff has probably dried out by now, and let the PS burn out or something. That's the usual problem posted here.
You'll want fresh grease if you replace the Power Stage. I think this is the right stuff.
Try a search on "Power Stage" here, or look in the 700/900 FAQ for possible tips.
As for parts locations -- they change over time and between models & engines. Just something we have to live with.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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