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07-14-2020, 08:42 PM
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#1
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Member
City: Laguna Beach
Vessel Name: SCOUT
Vessel Model: 1980 CHB Trawler
Join Date: Jul 2020
Posts: 8
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Advice on replacing/rewiring battery selector switch
1980 CHB Trawler with original battery selector switch. It is very unlike the newer 3 post switches (rotary?)
Any advice on switching it out/re wiring?
Currently 2 house 8D's to a start battery thru an Blue Sea ACR (fused)
All wired in series on a single circuit battery charger. 2nd side of batt charger unused.
Alternator wired to house batteries.
Edit; I guess I should add has anyone done this? Guidance..
To make a schematic I would just tear into it and do it
Thanks!
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07-14-2020, 08:45 PM
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#2
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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Welcome aboard. Why do you want to change it out?
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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07-14-2020, 08:55 PM
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#3
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Guru
City: Bethesda, MD
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 2,164
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First post and it's an electrical one. Hang on, this might be a roller coaster ride.
It'd really help if you made a schematic of what's wired to where, and posted it. Because on an older boat you never know how far it's deviated from the original schematic.
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice, w/Highfield CL360 tender
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07-14-2020, 08:57 PM
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#4
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Member
City: Laguna Beach
Vessel Name: SCOUT
Vessel Model: 1980 CHB Trawler
Join Date: Jul 2020
Posts: 8
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Ha! Good question
Good question! It's old? I don't understand the wiring behind it? Where are the bus bars? Do I want start one 1/house on 2, etc? Or leave it 1 is all (house and start combined?
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07-14-2020, 09:01 PM
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#5
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Member
City: Laguna Beach
Vessel Name: SCOUT
Vessel Model: 1980 CHB Trawler
Join Date: Jul 2020
Posts: 8
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Well the first post could be motor mounts and busted bolts on the tranny/prop shaft coupler (letting the yard handle that) but where's the fun in that! Thanks guys!!!
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07-14-2020, 10:17 PM
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#6
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,131
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I had one of my engines out this winter. Not to bad to do after I built a crane. Changed the prop shaft coupler so I could use a split coupler. I replaced the drive saver with a spacer. I had to make 4 bolts out of all thread because of the new coupler design, but finally got it all done.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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07-15-2020, 06:04 AM
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#7
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Senior Member
City: Carefree, AZ and Ft. Myers Beach, FL
Vessel Name: Sea-N-Stars
Vessel Model: 1990 49' Albin
Join Date: May 2018
Posts: 304
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Welcome, UncleTimmyBro,
I'm not the electrical guru some of these folks here are, but I can offer this tip. Check out Jeff Cote of Pacific Yacht Systems' Youtube videos. He is very sharp and his videos are good. If he has one on battery selector switches and options to consider, it will likely be a good one that will be of value to you. Others on this forum will probably chime in and offer more information, too, but look through Jeff's videos and see if any cover the topic.
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07-15-2020, 07:00 AM
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#8
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Guru
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 7,166
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See attached schematic from BSS. Your "Charge" position should siwtch the 12vdc load from charger to batteries. Since battery chargers are now 'smart'/3-stage, this isn't really needed anymore
With your ACR, you should run the boat in "both" as it isolates the batteries - the ACR is essentially an automatic 1-2-both switch so you don't have to remember to manually switch. Getting line-of-site to the back side of the panel is likely difficult due to battery cables to rotary switch, so I understand your reluctance. Many users like to shut-down 12vdc while away from boat so going to OFF is an option. NOTE - Bilge pumps should be wired direct to battery with their own fuse to avoid being turned-off.
Best practice is to run alternator to engine start battery, though folks who have installed hi-output alternators often run to the house bank instead as they have relatively large battery banks. In theory, the ACR should mean it makes no difference. ABYC allows up to three cables on a lug, though having a bus bar/power post with a single cable led to the batteries sure makes life easier when servicing or replacing the batteries. .
What problem are you trying to solve, besides just figuring it out?
Peter
__________________
_______________________________________
Cruising our 1970 Willard 36 trawler from California to Florida
Join our Instagram page @MVWeebles to follow along
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08-28-2023, 03:27 PM
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#9
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Member
City: Lake Erie
Join Date: Aug 2023
Posts: 14
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I know it’s OLD!
did you ever resolve this? Or did you just leave it alone?
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08-28-2023, 04:11 PM
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#10
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Member
City: Laguna Beach
Vessel Name: SCOUT
Vessel Model: 1980 CHB Trawler
Join Date: Jul 2020
Posts: 8
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I received no actual wiring advice so I left it alone.
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08-28-2023, 04:19 PM
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#11
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Member
City: Lake Erie
Join Date: Aug 2023
Posts: 14
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Ok, well I’ll be looking into mine to see what I can find. If I figure anything out I’ll be sure to follow up with you.
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08-28-2023, 05:16 PM
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#12
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Guru
City: Seattle
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 4,281
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It’s hard to give good electrical advice with out seeing the entire boat system. Things that make sense on a boat with thrusters and household appliances won’t make sense on a boat that is only DC.
Now to complicate things are the needs of Li, AGM and FLA batteries.
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08-28-2023, 11:13 PM
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#13
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Newbie
City: Oxnard
Vessel Name: Slow Ride
Vessel Model: CHB Sea Chief
Join Date: Feb 2023
Posts: 4
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I have an 84 CHB with the same original switch. It is no,longer operational, I now has a three position main switch, a two position switch isolating the charger/inverter and an additional two position switch isolating the second larger alternator. I did not do the work, it was that way when I purchased the boat. If you’re ever up north in Channel Islands you’re welcome to stop by and take all the pictures and videos you want. Not sure if you can PM on this site but I would be happy to send you photos.
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