nyannucc
Oxford, PA
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Joined: 06/06/2007
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Hey Guys - was hoping some of you more experienced folks can help me out.
My 21SS has room on the front for another battery case and it fits perfect.
I am thinking of mounting the battery control switch inside - perhaps in the front lower storage area. This will keep it out of the weather, but more importantly, away from people who like to fiddle with switches. Does anyone see any concerns with this idea?
Also, is 10 gauge good enough of a wire or do you think I need to go 6 gauge? I am thinking of getting this if 10 gauge is good enough.
The switch is a Blue Sea Systems 9002E.
thoughts, ideas, etc. much appreciated as always.
Nick and Gina
Three boys, ages 7, 9, and 16.
(2) dogs, (2) goats, 2.5 acres
2004 Chevrolet Silverado 1500 Z71
2008 Roo 21SS
Prodigy, Equalizer
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nny12972
NY
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Joined: 10/25/2006
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1.) Switch inside is fine. Safer, too.
2.) What's your max 12V current load(A)? How long a wire run?
No more than 20A=#8 up to 20' run.(approx.)
No more than 35A=#6 13' up to 20' run.(approx.)
J
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Chuck_S
Broadview Hts, OH, USA
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Joined: 03/15/2002
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My switch is external so I can check to see that it's ON or OFF as I need it. I don't want to unlock the trailer to recheck if it's OFF when I park it for a couple of weeks, or ON for travel and camping -- or to operate the tongue jack. No one has messed with it yet.
-- Chuck
'06 Roo 23SS behind '07 Expedition out of Cleveland
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nny12972
NY
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No argument with Chuck....
......if dealing with forgetfulness is more important than possibly dealing with some kid, or a perp who might want to kill power to be sure there's no security.....or just losing a fridge full of goodies....or just running down the batteries because someone forgot to shut down the CO/smoke detectors......I've had mine inside for nearly twenty years---never forgot it yet!
J
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Chuck_S
Broadview Hts, OH, USA
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20 more years and you will! 
-- Chuck
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Scott_C
NJ
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Nick, good to hear from you! Hope you got your warranty items sorted - I've had loads of fun! 
10ga won't do you, especially mounting within our 21SS units because I suspect you'll want it near the "command center" for reach ins. You can buy exactly what you will need though by the foot at any boat store in the tinned stranded. Don't stop there though - get yourself the matching tinned lugs and pot the cable into them - this will make a lifetime cable for you. I did all mine when I installed my switch. Decide on your cable routing, take some measurements, and we can help you size the proper cable.
I'm with Chuck and like mine outside and clearly visible. You can see my switch location in this shot:
Finally, you might want to consider a switch like mine because it comes as a mult-mount configuration (flush panel, surface, enclosed), has a much smaller footprint, rated the same as the one you posted and it can be found about $10-15 cheaper than Blue Seas too. Mine is a BEP Marine Model 701, you'd want the 701-S for duals, all Boater's Worlds carry BEP.
2008 Shamrock 21SS
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nyannucc
Oxford, PA
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Thanks guys for all the info., ideas and help. I think I've decided to change my mind and keep the switch outside -
Scott, I appreciate the picture (and this is what swayed me) - you have a nice clean installation and the switch is enough out of the way to keep prying kids from noticing it....I'll probably copy 
Did you use 6 gauge?
Thanks guys!
Nick
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Chuck_S
Broadview Hts, OH, USA
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I used a standard battery ground cable. I have nut terminals on my batteries so there's a ring at each end, but standard automobile cables are specfic to the + or - battery post. Since my switch is external I switch the ground so the exposed terminal in the photo doesn't matter. It's a lot heavier than the white ground wire going to the frame.
Note if you switch the ground you only need to connect one (1) wire to the switch output. There can be several wires that need connections if you switch the positive post.
-- Chuck
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Scott_C
NJ
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Nick,
Only requires 8 gauge in the tight marine strand mounted there. I made all new cables for positive and negative sides and dumped the crimped ring terminals in lieu of tinned lugs I potted on and then heat shrinked. Factory cables had corrosion wicked 2" up under the insulation in only 1 year!
Scott
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