![]() ![]() I have seen mine go down to as low as 9v on cranking. ![]() A huge current flow is taken from the battery which pulls the voltage down to quite low levels. Now imagine this relay is now connected when you start the engine. The difference in voltage between the alternator output and the leisure batteries will not usually be very much 14.1V for the alternators and say 12.4v for the leisure battery around 1.4V So the current flow will be be relatively low and the cable and relay are specced for this. So when you start the engine and draw a huge amount of current this will not be pulled from the leisure battery. Think about this, normally when you switch the engine off this relay opens disconnecting the vehicle from the hab area. ![]()
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