24 volt trolling motor wiring

[Silvertip]

Re: 24 volt trolling motor wiring

If you are picking 12 volts off a 24 volt system you had better be very careful which battery you pluck it from. Either battery will work, but if you pull 12 volts from the same battery the +24 volt line is coming from you risk serious damage to 12 volt accessories due to an accidental ground situation. This has been discussed and a diagram has been posted in this forum in the last couple of weeks. Look for it

 

[chenke]

Re: 24 volt trolling motor wiring

If you are picking 12 volts off a 24 volt system you had better be very careful which battery you pluck it from. Either battery will work, but if you pull 12 volts from the same battery the +24 volt line is coming from you risk serious damage to 12 volt accessories due to an accidental ground situation. This has been discussed and a diagram has been posted in this forum in the last couple of weeks. Look for it

I have the trolling motor situation figured out. Im eliminating the old 12/24 switch and replacing it with a new 2 prong. It just means losing the screw teminals of the old receptacle thus requiring me to hard wire all my accessories to the 12v still coming from the starting battery. I will lose my 2nd battery gauge meter that monitored the front battery as it will not be able to accept the 24volt series. No big deal. Your last statement does bring up a question though. I do have a small accessory wire that powered my radio and depth finder. It was connected to the front battery which will now be a series set up. I know which diagram you are refering to. I saw the posting you submitted on it showing how to pull 12 off of 24. I see you have the diagram showing to tie to the lead and ground wire from battery number one. That is the same as connecting right to the wing nuts terminals of battery one isn't it? Also in this case if I can wire a 12v accessory to battery one couldnt I still put my 12v battery meter gauge on battery one allowing me to somewhat monitor the series system.

 

[Silvertip]

Re: 24 volt trolling motor wiring

Follow this carefully -- you can pull 12 volts from either battery and you can monitor either battery. But by doing so you NEED a ground connection. Any metal object in the boat or any situation that results in an accidental ground as I previously explained results in 24 volts across what is a 12 volt accessory and POOF. You have a dead device and/or smoke and fire from a direct short. How possible is that? I can't see your boat so I don't know. All I can say is to be aware and depending how big a risk taker you are you may or may not get lucky.

 

[tcase]

Re: 24 volt trolling motor wiring

Follow this carefully -- you can pull 12 volts from either battery and you can monitor either battery. But by doing so you NEED a ground connection. Any metal object in the boat or any situation that results in an accidental ground as I previously explained results in 24 volts across what is a 12 volt accessory and POOF. You have a dead device and/or smoke and fire from a direct short. How possible is that? I can't see your boat so I don't know. All I can say is to be aware and depending how big a risk taker you are you may or may not get lucky.

I understand the 24v system, but I'm trying to use one battery from that 24v t.m. system as an emergency starting battery for my outboard. I am using a Perco 1 2 All Off selector switch. Not sure which battery you are saying to use to pull the 12v. from to go to my Perco switch. Thank, tcase

 

[Silvertip]

Re: 24 volt trolling motor wiring

The plot thickens. How many batteries do you have -- total. What do you want the battery swtich to accomplish. How big is your motor (the gas engine)? Post a diagram so we can see exactly what you are trying to accomplish.

 

[tcase]

Re: 24 volt trolling motor wiring

The plot thickens. How many batteries do you have -- total. What do you want the battery swtich to accomplish. How big is your motor (the gas engine)? Post a diagram so we can see exactly what you are trying to accomplish.

Thanks for responding! I have 3 batteries total (1-12v cranking for O.B. and 2-12v in series for 24v T.M.) I want the switch to let me use one of the 12v batteries ( in the 24v T.M. system) to be used as a reserve cranking battery for my 150hp O.B. motor. I want to avoid the potential "accidental grounding" . Not sure which battery in the 24v system I should use. Sorry for the hand drawing, but not very good at doing on the computer.

 

[Silvertip]

Re: 24 volt trolling motor wiring

#2 on the switch connects the POS terminal on what you have labeled as BAT #3. You also need a ground cable going from BAT #3 to the engine block or the NEG terminal on the STARTING battery. Those cables need to be the same size as the engine battery cables. Battery #2 will charge with the engine running, it will start the engine, and it will run any accessories if the switch is set to BAT #2 or BOTH. Bat #2 in your diagram will NOT charge in any switch position and before you ask, no you cannot charge both toller batteries from the engine at the same time. After reading this it should be apparent that you need to re-number the batteries so they correspond to switch positiions. Right now BAT 2 on the switch is really BAT 3 in your diagram.

 

[tcase]

Re: 24 volt trolling motor wiring

#2 on the switch connects the POS terminal on what you have labeled as BAT #3. You also need a ground cable going from BAT #3 to the engine block or the NEG terminal on the STARTING battery. Those cables need to be the same size as the engine battery cables. Battery #2 will charge with the engine running, it will start the engine, and it will run any accessories if the switch is set to BAT #2 or BOTH. Bat #2 in your diagram will NOT charge in any switch position and before you ask, no you cannot charge both toller batteries from the engine at the same time. After reading this it should be apparent that you need to re-number the batteries so they correspond to switch positiions. Right now BAT 2 on the switch is really BAT 3 in your diagram.

Thanks again for the help. You're my new best friend! If I wire system like this will it eliminate the chance of the "accidental grounding" you had talked about?

 

[Silvertip]

Re: 24 volt trolling motor wiring

Yes -- That's why I told you to wire it the way I did.

 

[tcase]

Re: 24 volt trolling motor wiring

Thanks alot . You have been very helpful. I will be working on this project this weekend. I'll let you know how it turns out. Once again thanks for the help!!