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FJR Motorcycle Forums
Technical & Mechanical Problems
KrZy8 Gen2 - Charging Circuit
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<blockquote data-quote="Fred W" data-source="post: 983073" data-attributes="member: 3828"><p>No ridicule here.</p><p></p><p>The very first thing to check is that your Datel is giving you the straight scoop. Try to get ahold of a reasonably accurate DVM and measure across the battery terminals and compare that to your Datel's display. I know for certain that my Datel reads .1-.2V low and it is wired directly across my battery, with just a relay or switch in series. Contact resistance of the relay or switch <em>should</em> have minimal effect on the measured voltage as the meter draws extremely little current (no current = no voltage drop).</p><p></p><p>When I initially installed the Datel (many moons ago) I wired it to the switched power terminal strip I have up in the nose cowling, which also supplied power to my Heated Grips, GPS, and a set of FF50 aux lights. The problem with that scenario is that, while the displayed voltage was reasonably accurate with none of the accessories (or just the GPS) running, as soon as you turned on the grips or the Aux lights the error became even greater because of the heavy currents being drawn by those devices. What aI was seeing was the voltage drop on my power switching relay's contacts and the wiring harness to the terminal strip. You really want the Datel to be run direct to the battery on its own dedicated (low current) wires so you get the best look at actually battery (charging) voltage.</p></blockquote><p></p>
[QUOTE="Fred W, post: 983073, member: 3828"] No ridicule here. The very first thing to check is that your Datel is giving you the straight scoop. Try to get ahold of a reasonably accurate DVM and measure across the battery terminals and compare that to your Datel's display. I know for certain that my Datel reads .1-.2V low and it is wired directly across my battery, with just a relay or switch in series. Contact resistance of the relay or switch [I]should[/I] have minimal effect on the measured voltage as the meter draws extremely little current (no current = no voltage drop). When I initially installed the Datel (many moons ago) I wired it to the switched power terminal strip I have up in the nose cowling, which also supplied power to my Heated Grips, GPS, and a set of FF50 aux lights. The problem with that scenario is that, while the displayed voltage was reasonably accurate with none of the accessories (or just the GPS) running, as soon as you turned on the grips or the Aux lights the error became even greater because of the heavy currents being drawn by those devices. What aI was seeing was the voltage drop on my power switching relay's contacts and the wiring harness to the terminal strip. You really want the Datel to be run direct to the battery on its own dedicated (low current) wires so you get the best look at actually battery (charging) voltage. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
KrZy8 Gen2 - Charging Circuit
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