In this video, we test an RV (1999 Ford Econoline) where the house battery isn't charging. Learn to test a battery isolator solenoid using DYVO. Understand the limitations of traditional battery solenoids and why it is better to use an automatic charging relay or latching solenoid (switch) such as the Blue Sea Systems m-ACR 7601. Also applicable to starter solenoids and continuous duty solenoids.