Quote Originally Posted by Greg E View Post
Are you talking about triggering the pump thru the relay in the cab or the one in the engine bay?
The relay in the cabin has to be on for the pump to run on hi or low. It send power to the relay in the engine bay. The relay in the engine bay only redirects the power through a resitor to make the pump go to a low setting. So to prime the pump you should only turn on the relay in the cabin.