Posts: 120
Location: Twin Cities Metro | When the starter is engaged, there is a large current draw from the cranking battery. The internal resistance of the battery produces a reduction in the terminal voltage of the battery. There is also a small voltage drop across each wire in your electrical system: the thicker the wire, the lower its resistance and the smaller its resulting voltage drop would be. This voltage drop, no matter how small, reduces the effective voltage that is being applied to whatever device is connected to it.
When you engage the starter, the battery's effective voltage is lowered. This drop, coupled with the drop in voltage across the length of wire connecting your graph to the battery, probably reduces the voltage the graph experiences below its minimum voltage. The fact that only one graph turns off suggests that the wire connecting that graph to power is probably the culprit.
There are two ways to minimize the resistance of the wire leading to your graph: 1) Use thicker wire or 2) reduce the length of the wire.
If you wired the graph yourself, be sure you're using the minimum length you need, that the gauge (thickness of the wire) is sufficient, and that it is marine grade wire. Marine grade wire uses tinned copper strands to reduce corrosion and is more flexible than automotive wire so that it can wind around corners more easily. Here is a chart that lists what gauge wire you should be using for various graphs for the length of wire you're using:
https://humminbird-help.johnsonoutdoors.com/hc/en-us/articles/906554...
Note how the longer the wire "run", the thicker the wire that is required (lower gauge number refers to thicker wire). Best of luck!
ps Kirby could be right as well about it being a faulty battery.
Edited by RobertK 10/12/2023 9:02 AM
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