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How To - Reactivate a suspended 2nd account which doesn't have enough isks:
Transfer the isks from your wealthy account to the suspended account. To do this you should send it to the character on the suspended account.
When buying the GTC simply tell the seller the character name on the suspended account. The character must be the same character whom you sent the isks too.
Now login to this website in the Account section, it must be the Account section because often you will be denied access to the forums if the account has expired.
From the Accounts page you should see in Common Tasks a new icon and text. Click where requested.
Check the offer, are the days and the amount of isks as agreed? If so then accept it and your account is now active.
Not Enough Isks on your active account buy you have enough on your expired account?
This is easier, you are already good to go so long as the seller will make the offer to your expired character who has the isks.
This is from the official Eve Forums:
http://www.eveonline.com/ingameboard.asp?a=topic&threadID=1108232