Wiring Lowrance 522c

[MinnesotaBoatman]

Last year I got a new Lowrance 522c to replace my old Bottomline. After I installed it, it would turn off when I started my big engine. This was a pain while I waited for the GPS to reacquire.

I replaced the starting battery (as well as the trolling batteries) thinking that there would be less voltage drop causing it to turn off. Same problem, it would still turn off.

This spring while the boat was sitting conveniently in the garage, I installed new 12 guage wire (with inline fuse)and separate control switch and connected it to the starting battery. When I cranked the engine, it turned off again.

Finally, I connected my new wiring to one of my trolling batteries and it worked. No interference from the trolling motor and it doesn't trun off when I crank the engine!

[Chris Haley]

I'm not a mechanic, but I'd say there is something going on with your starter. It might be drawing too many amps dropping the amount the electronics need to stay on. Maybe have your starter checked before it leaves you stuck on the lake.

[PerchJerker]

I'm not a mechanic, but I'd say there is something going on with your starter. It might be drawing too many amps dropping the amount the electronics need to stay on. Maybe have your starter checked before it leaves you stuck on the lake.

I tend to agree. You said you have a new starting battery, as long as it has enough cranking amps for your motor then there is likely to be something else going on with the starter that is causing the voltage drain.

[Chris Haley]

Running electronics off your trolling motor batteries is not a good idea either. You will get interference at some point. You also run your battery down faster, if you're running a 24v system it draws one down more than the other. Best to get your motor checked and put it back on your cranking battery.

[fishorgolf]

I believe this same topic has come up before but I did not keep track of the solution if there ever was one. Maybe someone remembers the thread and can bring it back. I have a friend with a similar problem and would be very interested in the fix to share with him.

[sheepheadslayer]

Had the same problem. The only thing to solve the problem is take it back and get a humminbird. Thats what I had to do.

[delcecchi]

What kind of motor? My 115 merc doesn't cause this with my 522. Try putting a voltmeter across the power when cranking. Something weird going on. The voltage shouldn't drop that low.

[Cicada]

I had the same problem with a 30hp Yamaha. I kept my old battery when I got the different rig. It would happen when the battery became low. The battery finally went kaput and I replaced it with a battery with more cranking power. It solved my problem.

[MinnesotaBoatman]

The engine is a 4.3L 190 HP Mercrusier.

[Sandmannd]

I have that problem from time to time. Usually when I forget to charge my batteries after an outing. A new battery took care of it for me. If that doesn't work for you, like others said, I would check the starter.