Cheaper than buying the Blue Seas System. The Yandina combiner by the way is cheaper than buying just the Yamaha isolator lead. Of course the two batteries will have to have a common ground connection. One terminal for each positive post and one terminal for a negative post. It comes complete with terminals that are simply connected to two batteries. What will work just as well is a Yandina battery combiner. Unfortunately, the F90 does not offer this feature. Yamaha refers to their second battery isolator as a "multi charge monitoring system". It costs less than the Yamaha isolator lead and is a hell of a lot easier to install. One wire to the positive post of the start battery, one wire to the positive post of the house battery and one wire to the negative wire of either battery. I have used and can recommend the Yandina combiner. Stop the motor and the device disconnects the start battery from the other battery(s). When ever the engine is producing certain voltage the device will automatically parallel two or more batteries so that each will be charge while the motor is running. The isolator device for the most part has been replaced by a device known as an automatic charge relay (ACR), voltage sensitive relay (VSR) or combiner. Plus, you don't have to install and route another cable from the motor to the battery. The problem with the Yamaha isolator lead is that in a number of cases it can cost more than a different component which offers the same benefit. When starting with 12 ~ 14 volts it is not desireable to lose any voltage as this will slow down the current flow. The electronic device known as an isolator has an inherent deficiency insofar as it uses diodes which result in voltage drop. You will need to add at least one to the Yamaha isolator lead for an SX motor. Early Yamaha isolator leads do not have circuit protection (fuse or circuit breaker). I thought you might have been talking about that lead. Yamaha uses the term isolator lead to get current to a second battery. The benefit is to guard against a weak or dead battery from draining the charge of a strong battery in a muti-branch configuration.I just wanted to make sure that I understood what you were wanting to do. A isolator is a electrical device that divides direct current (DC) into multiple branches and only allows current to flow in one direction in each branch.
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