If all the above is correct, do the following:
• Run the engine at cruising speed.
• Watch the data on the Status Page.
• Note the LS alternator Voltage sense. If it is above 12.8 V, then the alternator is producing power to match the load.
Take a screenshot of this status page to keep a record of the LS alternator Voltage sense. • Go to the Starter battery.
• Measure the voltage on the starter battery accurately.
• Compare this to the Voltage on the screenshot. The voltage difference x the current in A is the cable loss.
So 13.2 V at the battery, and 12.8 V on the Scotty AI Status Page, means 0.4 V at, so say 100 A = 40 W. It is far too high, and you check the Negative path at first for a good connection. A good loss is 10-15 W. • Look at the Scotty Status page screenshot. If the number it shows is less than the above calculation, then the problem is the negative connection.
• The negative wire from the Starter battery to the chassis in the engine bay must be bolted to and paint-free and clean metal surface.
• The negative wire from the Target Auxiliary battery to the chassis must be bolted to an paint-free and clean metal surface on the chassis.
• We do not recommend laying a separate negative wire, unless there is no chassis for example on a boat. The negative wire is generally the problem in 95% of all circumstances.
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