Originally Posted by US1Fountain
Is this done by simply using a DVM and comparing voltage readings at the battery, to at the load itself, to determine the actual % drop?
Mainly for a simple way to check the actual real life drop do to the number of terminal connections, battery switch, and fuse/CB have on the circut, as opposed to a single
cable w/no break run.
To get an accurate measure of voltage drop, you must read with DVM, between both leads at the load device. Full load must be applied, motor
light blower fridge ac whatever must be running at full load to cause the voltage drop if there is any.
Remember, any connection in the circuit, fuse holder, term connector, switch terminals etc can cause a drop due to high resistance connection caused by corroded or loose connection.