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  1. Member
    Join Date
    Oct 2019
    Location
    Keswick, Ontario
    Posts
    1,492
    #61
    Interesting. I guess I never thought about it.

    Why don't we just run our graphs off of the trolling motor battery then?

    Quote Originally Posted by JR19 View Post
    When you have a 24V system the batteries are hooked in series to achieve the voltage. When you have a parallel connection all you are getting is 12 V from one battery.

    TM 24 V...hot from TM to battery A hot...negative from TM to battery B negative...jumper wire from battery A negative to hot on battery B...this is a series connection.

    Now if you only use one battery in your system you have a parallel connection. When you isolate your connections for the graph it should be hot from graph to hot on battery A and negative from graph to negative on battery A...Battery B is not in use. Think of it just like you have your onboard charger hooked up. You may have 2 batteries to achieve 24V for the trolling motor (which is a series connection) but your charging device is isolated to each individual battery in a parallel connection.
    1997 Ranger 692VS
    2014 Mercury 175 Pro XS 2B111166

  2. RIP Evinrude 1907-2020 JR19's Avatar
    Join Date
    Feb 2005
    Location
    Columbia, KY
    Posts
    12,610
    #62
    Quote Originally Posted by Ranger Rod View Post
    Interesting. I guess I never thought about it.

    Why don't we just run our graphs off of the trolling motor battery then?
    There is a tendency to have interference on the screen when your power is coming from trolling motor batteries. Plus as your trolling motor battery gets weaker throughout the day you lose voltage to the graph. The cranking battery gets some replenishment with power as you crank the motor and move from spot to spot. Even doing that it is still a good practice to charge your cranking battery as well as your trolling motor batteries every time you use the boat.

    The best method so there is little or no interference is to wire directly to the cranking battery. When doing this you want a fusible link just a few inches away from the cranking battery on the hot wire. If you pick up power at a distribution panel or a rocker switch you run the possibility of interference, hence the reason its a good practice to isolate graphs to their own dedicated run.

  3. Member 1BADAIR's Avatar
    Join Date
    Dec 2014
    Location
    OXFORD MI
    Posts
    3,895
    #63
    hook a voltmeter to the cranking battery and watch voltage while at higher rpm
    2011 Ranger z521/2023 250ProXS

  4. Member
    Join Date
    Aug 2012
    Location
    Easley SC
    Posts
    98
    #64
    Thanks for all of your input and suggestions. I've been out of the loop for a while. It may be worth mentioning that I switched to Raymarine graphs a year or so ago after my Hummingbird died then my boat was down for a while with engine issues. I never had this issue with the Hummingbird. I couldn't find any over voltage alarm or settings so I called Raymarine and the guy told me that there wasn't a setting and that is sounded like and issue with something on my boat. I'm going to go ahead and run all new wire as soon as I get a chance. And in regard to the comment about the fuse link location, mine is located near the console so I'll install a new one close to the cranking battery. I'll report back when I'm done. Thanks again..

  5. Member
    Join Date
    Aug 2012
    Location
    Easley SC
    Posts
    98
    #65
    Just wanted to give a quick update on this issue. I FINALLY got time to work on my boat last weekend. Swapped out the rectifier Saturday and spent all day Monday on the lake. Looks like that did it. Graphs didn't shut down all day Also, my tach seems to be working right when before it was jump around erratically, it's now pretty steady. Anyway, thanks again to everyone for helping me figure this thing out!

  6. Member
    Join Date
    Sep 2017
    Location
    Pryor, OK
    Posts
    2,770
    #66
    Thanks for the update
    2022 Ranger Z520R, 2022 Mercury 250 ProXS 4s
    Dual 16” Lowrance Live’s at console, 12” Live with Active Target, Garmin 8612 and Livescope, and Humminbird 12” Mega 360 at the bow
    Lowrance Ghost TM

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