Third Battery bank wire termination?

kaelc

I have a factory installed (as far as I can tell) guest 2621A. It has three sets of charging wires leading out of the beneath the passenger rear seat, when it seems to terminate on the port side battery compartment there are two sets of wires. I would guess the 10amp charging cable is for big group 31 house battery, that may have never been installed? Anyone have a factory wires third (house battery) battery and where is it?

I asked it in the Facebook group due to the ease of posting photos. https://www.facebook.com/groups/402371550212146/permalink/1339794729803152/

thataway · Posted: Sun Dec 19, 2021 4:47 pm Post subject:

The manual states:

kaelc · Posted: Sun Dec 19, 2021 5:10 pm Post subject:

Thanks Bob, they have 5, 5, 10 fuses at the charger and fuses in the port battery compartment, I’ll check those rating next time I’m in the boat. I figured they are both 5 amp but need to verify. The two charger positives that terminate there then go into a m-ACR a blue seas automatic charge relay. Which I don’t think they should? I think the double fuse is redundant.

I’ll check the colour combination as well. Thanks for comment.

thataway · Posted: Sun Dec 19, 2021 5:51 pm Post subject:

The manual calls for fusing 15 amps at each of the outputs. (irregardless of the 5 or 10 amps). The manual does identify which of the outputs is the 10--and you should be able to identify the one which as the blue strip--I would guess that most likely the blue strip is the 10 amp output.

Since it goes to the ACR, then you would only put one lead there. As there is any voltage greater than 13.7 (+/-) will combine the batteries, so putting 2 leads to batteries is redundant...

You do want to fuse each leg. Not sure where the other fuse is--but the legs to the ACR / switch are going to be fused at some place--probably in the 60 amp or so range...This allows for the outboard charging, which is what is normally "combined".

kaelc · Posted: Mon Dec 20, 2021 12:30 am Post subject:

Thanks Bob, I appreciate it. Catching the 15 amp fuses in the manual is a good one. I think to maximize shore charging each of the 5amp wires should go directly to the two batteries. I'll hunt tomorrow for the Red/Blue wire!

thataway · Posted: Mon Dec 20, 2021 4:11 pm Post subject:

The Guest chargers are basically "recovery" for the top off. If one is using a lot of 12 volt appliances when on shore power--and needs more rapid charging, we usually go with one of the larger smart chargers--Master Volt, Blue Seas, Victron, Noco, and Pro Mariner, Pro Nautic, are several of the ones I recommend. Also monitoring with a Victron 702/712 is a good way to carefully trace battery use.