Will not start

[MA87K5]

I have a 97 Blazer 4.3L that will not start. I checked the pump plug and got no power with the key on. No power at the relay when the key is turned on. I even disconnected the oil pressure switch to bypass the switch. Still no go. I have batt power at the relay but no ignition key power. When I manually actuated the relay the pump came on. I'm leaning torward the computer. Please help me and let me know if I'm correct or not. Also fuse is good.
Thanks.

 

[1979jimmy350]

are you able to get any codes with a reader? if you are, check for thoese first. Then check the wire that runs to the computer from the relay for an open before you buy a new computer. Also if you know any body with the same year blazer see if your computer will work theirs. I had some problems with my s-10 blazer a few weeks ago and was ready to go spend 150 on a new computer unitl i pluged it into a friends and it worked

 

[MA87K5]

Checked all the connections and found no open connections. Still leaning to the computer.

 

[MA87K5]

update very long overdue. Turned out to be the ignition switch.