Boondockboost

IOD fuse is good i checked the fuses under the hood a few times all seem good. Theres no power to anything at all, not just lights. I just rechecked the ecm plug and it was all the way in and tight.

Not being a smart *** but I only saw one? I'll double check it for sure to make sure its good but,

Hey everyone, new to the forum i have a 99 eclb. I put a new ecm in after signs of a failed ecm, while I was waiting on the new one I pulled the alternator out to test it to avoid the bad diode problem. So I figured id do the mod w-t wrote about with the regrounds and new alternator power wire and what not. Well cut to I finshed it all up put the new ecm in and hooked the batterys up and i got nothing? No interior lights,headlights and no power at all. I had batterys tested and they were good. Cleaned all of my grounds again made sure everything was hooked up .checked over the wiring a few times im clueless now, im not good at electrical diagnostics, any idea of where to start? Thanks for the advice