Battery Disconnect Switch - Event Date: 16 Dec 2017

BATTERY CUT OFF SWITCH



Used the white ground wires, no shorting if wire ends accidently touch the frame:

Link:
http://www.yamahafz1oa.com/forum/picture.php?albumid=786&pictureid=4500

Mounted the weather proof electrical box on the tongue near the batteries for shortest wires:

Link:
http://www.yamahafz1oa.com/forum/picture.php?albumid=786&pictureid=4499

The cover has one screw to allow the cover to pivot away

A bungee holes the cover closed but allow quick aceess:

Link:
http://www.yamahafz1oa.com/forum/picture.php?albumid=786&pictureid=4501

The visible wires are the emergency breakaway cable, not electrical...

Box from homedepot:

Link:

https://www.homedepot.com/p/12-in-x-12-in-x-6-in-Junction-Box-R5133713/202043349

Used the ears to hold the bungee in place.

Enjoy!

My disconnect is on negative side also and it works perfectly.

Originally posted by Olddawgsrule Originally posted by StephenH Despite what NHRA says, I was always taught connect positive first, then negative; disconnect negative first, then positive. That is why my disconnect is on the negative side. I don't think I will be racing my 'Pod, so I will stick with the old standard. The real answer depends on the reason. Also why I say, if in doubt DPDT. No chance on any feedback of power both sides are dis-connected. I bought my transfer switch for the house because it is a DPDT. No possibility of any feedback to the folks working the lines out there trying to get me grid power back.

All transfer switches have to be double pole.  Modern house services are double pole so anything less would not meet electrical code.

I don't have a disconnect switch on my Pod so I haven't had to make this decision for myself.  It seems like NHRA rules are dealt with by generally competent mechanics, which may be a factor in choosing to switch the positive side.  I don't really know, but I suspect they tend to use specialized, fused switches that may have a lot more spark protection than a cheap RV cutoff switch.

For amateurs, using a cheap knife blade cutoff switch, I think putting the switch on the negative side is probably the best way to go.  Those switches are almost pure metal conductive surface that greatly increases the possibility of an accidental short circuit. 

There are slightly more expensive switches that have no metal exposed that should probably be used if one insists on putting the switch on the + side.  They tend to be a little more effort to install too.

Electrically, it makes no difference.  A good switch, competently installed will work on either side.  For a casual installation, especially of a knife blade switch, the negative side is the way to go.

Yes, I'm pretty much switching my answer! 

TT

If ever in doubt of which side to tie into DPDT. Removes all doubt.

MHO on the matter.