I have a 78 Johnson 115 V4 on the back of my 82 Ranger 330V. I have put much (probably too much) time and money into both of them. Both boat and motor perform well. The bought came to me with a Humminbird Helix 9 at the bow, and I have added a garmin Echomap 9 with side and downscan. Both are hooked up to my house battery, which also serves as my cranking battery. Other accesories connected to this battery are the bilge pump, gauges, horn, etc. I also have navigation and stern lights, which rarely get used. No, for now. My concern is weather or not the charging system on my old motor can keep up with all of these toys. If I'm not mistaken, I believe the rectifier on my motor puts out 10 amps. I have no idea how many amps newer outboards put out. Am I ok to run both fish finders for most of the day? Or, will I have to stop fishing every hour or two to run the boat around to charge the battery? I know that this old motor was not designed with these gadgets in mind and it is what it is. should I be running my gadgets on a seperate battery?