Anything between 12 and 14.5 or so would be fine to run the equipment. Did you check voltage engine on? Noise on the other hand..... THAT could do it. An easy test is to get a 12 volt battery and supply the equipment independent of ship's power. The likely culprits are an issue with the alternator (bad diode or ???) putting a lot of noise or an issue with the spark plug wires (gas engines only).I flew a plane once that would do this, to get any nav gear to work I had to shut off the alternator and then turn it on again when done. If you have an oscilloscope, you might see something connecting it to the power leads and running the engine. Joe Coquina C&C 35 MK I
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Thursday, June 02, 2016 1:57 PM To: CnC CnC discussion list Cc: David Knecht Subject: Stus-List Voltage I have been having problems with my GPS (Zeus T8) and Autopilot (EV-100) since I installed them last year. The T8 periodically starts activating the touch screen and beeping away like I am tapping away on it. This correlates with nothing I have noticed. Yesterday it did not do it under battery power during a race, but started when I started the engine. I am 95% sure that it has happened without the engine running as well. The Raymarine periodically freezes while in Autopilot mode. This also happens with or without the engine. A B&G tech support guy I talked to thinks the problems are related in some way to the network (Seatalk NG/NMEA) or the power. Yesterday, I detached the network cable from the B&G when it started beeping and continued to beep away. So that leaves power. Today, I checked the voltage being supplied to the T8. The batteries had not been topped up since a race the day before and were reading about 12.5-12.6 volts (AGM). At the GPS power cable, I measured 12.2 (one battery)-12.3 volts (both batteries). Does that voltage drop make any sense and is that 0.3 volts potentially relevant to the problems? Dave Dr. David Knecht Professor of Molecular and Cell Biology Core Microscopy Facility Director University of Connecticut 91 N. Eagleville Rd. Storrs, CT 06269 860-486-2200
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