Posts: 120
Location: Twin Cities Metro | Grass - 10/12/2023 6:36 AM
My previous graph was also a Humminbird, so when I installed the new graph, I used the same power line that was used for the previous graph. (It had the exact same connection going into the graph)
This may indeed be the problem, as Kirby suggested. While the connector may be the same, the wire for the previous unit may be a smaller diameter wire than is required for your current unit. When you upgrade units, the power consumption needs often go up. So using the cord from your old unit may be causing a larger voltage drop within that wire.
An alternative to Kirby's suggestion is that you use the power cord that came with your unit (as Baby Mallard suggested!). As long as it reaches the connection board under your console, I would try that rather than fishing a new wire all the way to the cranking battery.
When you do that, you may find that the connection board that the old wire is connected to has a fuse in its circuit. They are often the small automotive fuses. The fuse in that circuit is probably correct for your old unit, but you may want to swap it out for a larger fuse if your new unit has larger current capacity needs. It's probably no problem, but you might want to check it. The reason is this...
If your old unit was fused for, say, 2.0 Amps to protect its electronics, while your new unit is designed to take up 3.0Amps, you might exceed that old fuse during normal operation. I suspect it isn't really a problem since you haven't noticed your fuse blowing, but I would check it.
Edited by RobertK 10/13/2023 10:31 AM
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