Hello Ambet717
and to the Gulf Stream Owners Forum. We are glad to have you join us here and we look forward to reading of your adventures and experiences. I am sure you will enjoy the website and forums. Good luck, stay safe and keep us posted.
Make sure the battery disconnect it turned on. If so, I would suggest that you trace the 12+ from the battery bank to the over current protection device (fuse or circuit breaker) verifying they are good. Continue on to the battery disconnect solenoid ( line & load side) for the same. If this all checks good, check the 12- to verify that it is properly grounded to the chassis. Make sure, sometimes it looks OK but looks can be deceiving. Let us know what you find.