have a d15 and we can get it to start after unplugging and letting it sit for a little while, then replugging the relay in. it will start sometimes and run for a bit, then it will die and the relay will make a really terrible sound, is there any way to bypass the relay?

 

not for any real use of the vehicle other than component testing

replace the main relay

 

It's dangerous to bypass the main relay permanently.

It would be much cheaper to resolder the main relay:

http://techauto.awardspace.com/mainrelay.html