Voltage Drop- How Do I Check?

Using your multimeter (DVOM or digital volt ohm meter) to scope out excessive voltage drop. Diagram from one of the author's books, Advanced Marine Electrics and Electronics Troubleshooting We received a question from a reader the other day asking about how they might go about checking for excessive voltage drop on their boat. Good question that needs a bit of explanation. First of all, what is voltage drop and why do you need to care? All of the electrical equipment on your boat is ...