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Old 07-10-2017, 06:07 PM   #1
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Seneca 6V Wiring

I'm preparing to swap my bad 12V Interstate batteries with 6V Trojans. Based on all of my research, here's how they'll be wired up:



But -- what are the other leads coming off of the existing system and where should I wire them into the new system? One is a large gauge red cable running to the solenoid in the battery compartment and other are two smaller gauge black cables that go into a cable harness and take off under the chassis.

Any guidance/assistance would be appreciated. Thanks!
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Old 07-10-2017, 07:23 PM   #2
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For best performance (Charging/Discharging) ALL loads should be connected to the bottom right terminal (POS). Unless one set is house and one set is for the engine? Then you would not want to use 6 volt batteries for the engine (starting), and they would not be connected in parallel, they would be separate.

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Old 07-10-2017, 07:31 PM   #3
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For best performance (Charging/Discharging) ALL loads should be connected to the bottom right terminal (POS).
Thanks. That makes sense. Maybe they just spread the loads out in the as-delivered 12V setup? I'd still be curious what all of the loads are and which cables go to which.

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Unless one set is house and one set is for the engine?
No. This bank is just for the house.
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Old 07-11-2017, 12:14 PM   #4
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Originally Posted by Spot10 View Post
I'm preparing to swap my bad 12V Interstate batteries with 6V Trojans. Based on all of my research, here's how they'll be wired up:
I agree with your wiring diagram.

What model number batteries are you planning to use?
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Old 07-11-2017, 12:47 PM   #5
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What model number batteries are you planning to use?
I picked up four Trojan T-105's.

I actually missed an additional ground wire in the diagram of the current setup, that's coming off of the bottom left battery's negative terminal. I'm thinking that the ground and the two positives on the bottom right might go to the inverter. Still not sure what the solenoid positive is for. I've requested the schematics from Jayco, so that should help when they show up.

Once I determine what all of these peripheral loads are and where to hook them into the 6V system, I'll be ready for the install. I have a replacement PD4590 converter showing up tomorrow and am hoping to knock it all out tomorrow night.
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Old 07-15-2017, 12:16 PM   #6
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So if I calculate this right... you are going from reserve capacity of 640 to about 890?

or 265Ah to 370Ah.
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Old 07-16-2017, 10:12 AM   #7
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Thanks to Robbbyr for the confirmation and additional information. I want to share how I did the conversion, as reference info for anyone else who might be interested. Here’s how it ended up:










I went ahead and extended the top-right and bottom-left battery terminal posts so I could co-locate all of the loads and all of the grounds. I covered them with anti-corrosion grease after the photos. IMO, the bank is much simpler in this configuration. There are two less cables than the stock configuration and it’s easier to get to the fill ports.


If my math is correct, we went from 384 Ah (4 * 96) to 450 Ah (2 * 225) in the swap and ended up with a better “true” deep cycle battery. It was time to swap the batteries regardless, and the cost/benefit seemed worth it to me. Paid $503.96 for the set at a local farm and ranch store. Hopefully it pans out.


We’ll be putting the new bank to the test next weekend while dry camping for four nights. Can’t wait!
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Old 07-16-2017, 10:33 AM   #8
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Very NICE job!!!
Let us know how the outing went and how low your batteries were in the morning when you woke up.

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Old 07-16-2017, 12:36 PM   #9
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Looks great! Keep them watered up and don't excessively discharge them and you should get years of service from them.
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Old 07-16-2017, 12:58 PM   #10
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Yes... nice job. sooner or later we all are going to need to replace our house batteries, and this is a classic upgrade along with replacement that does not break the bank beyond what a replacement set would cost.
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