Hi there, been browsing this site for some time now, great info on here, thought i would join and have some fun and see what else i can learn. I have a question regarding the hour meter on my boat. I am fortunate enough to be able to work on my boat in the off season in my garage. I purchased the boat at the begining of last summer and used it all season with zero problems. When i got the boat the hour meter was not working and i asked the guy that i bought it from how long it had not been working for and he said ever since he owned it :-/. Anyways, i pulled it out of the dash last night and looked it over, only connections it had on it was for a positive lead and a ground. I hooked the gauge up to my 12volt power supply, and wouldnt you know it started working and and rolling over the numbers. I said, oh good, guage functions, must just not be getting any power when installed in the boat. I checked the wires that connect to the gauge for voltage when the key was in the run (on) position, and i could get any voltage readings. So i took the wires and connected them to a 12volt power source when the key is in the run position, i now had power at the wires that plug into the guage. So i plugged the guage back in and turned the key to the run position but the hour meter still didnt work. This leaves me scratching my head. With the key in the on position, i had 12.87 volts at the end of the plug that connects to the gauge. When i had the guage connected to my power supply, the power supply was putting out 14volts. I am wondering if that slight decrease in voltage between my power supply and the boats battery would be enough to cause the gauge to not operate. Thanks for your help