Dave I was an electronic tech in the navy for 21 years, so I have a little experience equipment. However I will no way attempt to diagnose your problem without having a hands on. I will tell you that 0.3 volts variations from the supply is not going to cause any problems. You can check the specifications on your equipment, in a manual or on the net and you will find that tolerances are far greater than that.
I will point you to some common problems that can create all kinds of weird symptoms. I am assuming you have and know how to use a mustimeter. I am also assuming it was working 100% correctly at one time. 1. Check the ground on all your batteries for a. Tight connections b. Corrosion free connections. c. While you are at it check all the connections. d. Check resistance from ground on the battery to some common ground. e. Check for stray voltage on the ground. 2. Check all your connector/plugs a. for corrosion, water or any contamination. b. Check the pins and insure they are fully extended, none are pushed back even a little. c. Check the female pins for the same, to ensure a good contact. 3. You will need to check your charging system for proper ground and power. No corrosion or loose connection. No stray voltage. 4. If none of these produce any results, it could be a number of things. But most likely it is one piece of the hardware/software is gone bad and needs to be replaced. If you know someone with the same set up and will to work with you, you can swap components until you find the bad component. R and R a component. If that does fix it. Put the original back in. 5. It could be as simply as the firmware is corrupted and needs to be flashed and reinstalled. Hope this helps. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Thursday, June 02, 2016 10:57 AM 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
_______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
