Ive wired up a Koso temperature gauge and it works fine when the ignition is on, no engine running, but once the engine starts it has problems: gauge cycles through the "power on" loop endlessly. I've checked all connections, nothing is loose. The gauge needs between 6v and 12v to work, and while engine running power never dips below 12v. I've had it wired to the orange wire from ignition, the purple wire from ignition and the gray battery positive wire to horn (cross checked with the wiring diagram. All present the same issue.
battery on, no engine:
battery on, engine on:
Just wondering if there is some wiring issue that I need to solve, or if this could just be a defective gauge?
here is the wiring for power to the gauge (connected to the orange ignition wire and black ground wire)