1997 Honda BF90A. Voltmeter and Tachometer acting strange.
At idle, approximately 900 RPM, boat voltmeter and tachometer appear to give accurate readings. As RPM is increased boat voltmeter voltage drops and tachometer fluctuates. Thought voltmeter was bad so connected Fluke multimeter to boat voltmeter terminals. Fluke meter confirmed meter was relatively accurate. The following readings were taken at various RPM.
Sometimes when boat voltmeter is low in 5 vdc range hitting tilt switch will cause voltage to return to approx. 13 vdc. Tachometer does not fluctuate as much or as rapidly as boat voltmeter. Motor will run with battery disconnected but will sputter at low RPM. Tilt will not operate when boat voltmeter is reading in 5 vdc range.
Any ideas?
At idle, approximately 900 RPM, boat voltmeter and tachometer appear to give accurate readings. As RPM is increased boat voltmeter voltage drops and tachometer fluctuates. Thought voltmeter was bad so connected Fluke multimeter to boat voltmeter terminals. Fluke meter confirmed meter was relatively accurate. The following readings were taken at various RPM.
RPM | Boat Voltmeter (approximations) | Fluke on Boat Meter Terminals | Fluke on Battery Terminals |
900 | 13.5 vdc | 12.49 to 13.38 vdc | 12.84 vdc |
1000 | 4.5 to 12.5 vdc | 4.9 to 11.77 vdc | 12.82 vdc |
1500 | 4.5 to 5.5 to 10 vdc | 2.6 to 12.95 vdc | 12.77 vdc |
2000 | 4.5 to 10.5 vdc | 6.12 to 10.5 vdc | 12.75 vdc |
3000 | 4.5 to 5.5 vdc | 7.2 to 7.97 vdc | 12.8 vdc |
Any ideas?