rob v Posted June 28, 2009 Report Share Posted June 28, 2009 My new lowrance LMS525 is hooked up and so far working well. My problem is - sometimes when I start my engine (115Hp mercury optimax) the lowrance shuts off. Not always - but about 50% of the time. I have the unit hooked up via the fuse panel in the consol. I notice the voltmeter moves very low when I crank the motor. Is this a sign that my cranking battery is getting bad ? I don't notice any problem with the motor cranking or starting - it seems to turn over well. And I keep both my batteries (trolling motor deep cycle and my cranking battery) charged using my on board charger. Any suggestions/input from those in the know would be appreciated. thx. Link to comment Share on other sites More sharing options...
Guest skeeter99 Posted June 28, 2009 Report Share Posted June 28, 2009 My new lowrance LMS525 is hooked up and so far working well. My problem is - sometimes when I start my engine (115Hp mercury optimax) the lowrance shuts off. Not always - but about 50% of the time. I have the unit hooked up via the fuse panel in the consol. I notice the voltmeter moves very low when I crank the motor. Is this a sign that my cranking battery is getting bad ? I don't notice any problem with the motor cranking or starting - it seems to turn over well. And I keep both my batteries (trolling motor deep cycle and my cranking battery) charged using my on board charger. Any suggestions/input from those in the know would be appreciated. thx. sounds like your battery my lowrance units blink when I turn the engine on but does not turn off even though you have a on board charger the cranking battery may be sulphating(on it way out) ,crack plate inside battery or the bank on the charger is not working right on the on board charger I run 2 fishfinders and a gps(handheld) all on my cranking battery and they never turn off when cranking just to give you a idea Link to comment Share on other sites More sharing options...
ohhenrygsr Posted June 28, 2009 Report Share Posted June 28, 2009 Yea maybe you can also check your Ground and Positive connections scuff them up a bit and put some di-electric grease on them and check your voltage on the status screen it might help and solve your problem Link to comment Share on other sites More sharing options...
CLofchik Posted June 28, 2009 Report Share Posted June 28, 2009 If you don't have a multi-meter, get one. It's practically impossible to hunt down electric faults without one. It does sound like your battery is starting to go bad and the voltage is dropping below the Lowrance operating specs when under load, but until you take a voltage reading off the battery there's no way to be sure. At rest the battery should be somewhere north of 12v, but under 14v. When cranked it will drop but shouldn't go very far under 10v, the online manual for your fishfinder gives an operating voltage of 10v-17v. If the battery voltage is dropping below 10v when cranked, there's your problem, new battery. http://primus.lowrance.com/support/resultD...Type=5000#Goto7 Link to comment Share on other sites More sharing options...
rob v Posted June 29, 2009 Author Report Share Posted June 29, 2009 Thanks guys - the cranking battery came with the boat (used) when I bought it. I have no idea how old it is - I'll have to have a look at it and/or keep an eye on it. Link to comment Share on other sites More sharing options...
ohhenrygsr Posted June 29, 2009 Report Share Posted June 29, 2009 you can go have the battery tested to see how fit the battery is any local Auto parts store or Canadian tire should be able to do it for free Link to comment Share on other sites More sharing options...
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