Help needed on wiring Heated handlebar grips

I finally bought a pair and have them on and working. But the electrical
wiring is less than the perfect solution. I used the default of connecting
them directly to the battery but this means that I will almost certainly be
attempting to bump start the bike in the near future. Can anyone help me
with clear directions on how to connect them to the switched side of the
ignition? On an SV650 'natch

 

Mo Childs emerged from their own little world to say

You need to connect them to the battery via a relay - your ignition switch
will not take the current.

You can buy relays from Maplins/Halfords/RS components

Have a look at
http://www.socweb.co.uk/forum/forum_posts.asp?TID=19904&get=last

 

Mo Childs says...

Wire them into the horn circuit. It's the least used and most easily got
to of all of them.

 

Looking at http://www.svrider.com/tips/gripheaters.htm I managed to filch a
section off the page.....

The SVX has a spare connector in the headlight bucket with switched power
and ground, presumably to run the running light over the headlights on the
SVS model. The joy of this power source is that it only comes on with the
key, meaning that the grips can't drain the battery if accidentally left
onyou could use the cable coloured
HTH


--


--
Robbo

Trophy 1200 1998
BMW K100 RS 1984
"Fairly Quick" status. Silver level
BotaFOF #19. E.O.S.M 2001/2002/2003/2004.
B.O.S.M 2003, 2004
FURSWB#1 KotL..YTC449
PM#7
..

 

I wired it into the fan circuit on SO's bike, which was pretty easy.
Whatever you use, make sure it's a supply that switches off with the
ignition.

 

As another poster said, I'm pretty sure (CBA[1] to dig out the manual ATM)
the SV650S has a +12V aux supply connector hanging loose in the fairing
(or it might be the EX250). In any case, the horn supply is convenient
and is switched by the ignition switch. The grip heaters I've got are
only 22W so they don't really draw a significant amount of current, less
than 2A, which should be OK as the horn circuit is fused for 10A, IIRC.

[1] actually I can't find[2] the damned thing.
[2] I know there is a JPG of the SV650 electrical system online somewhere,
check out http://www.sv650.org.

 

http://www.svrider.com/tips/svs-wiring.htm has links to JPG and PDF
versions of the 2002 USA/Canada SV650S wiring diagram.

 

Thanks for all of your helpful the suggestions, it is just the positive side
that needs to be wired in to the Horn circuit (or whatever I find easiest of
the other ideas) I can leave the neutral directly attached to the battery to
avoid more wiring work?

 

Use the feed to the front brake light switch.
Thats what Honda use for their genuine accessory hot grips.
Suzuki may have been a bit Pikey, as is their wont, and used a lower
rated cable and fuse than Honda do, but have a look, as it saves all
that extra wiring.

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The upper radiator support bolt on the LHS is a good point to attach an
earthing lug with a star washer. No sense in running a lead all the
way back to the battery, as the (-) side of the battery is connected
to the frame of the bike, and the frame is a pretty good conductor.
Make the earth lug |star washer|frame connection under, not over, the
radiator mounting lug for best results.

Whatever method you use to tap into the horn (+) feed, don't use a
Scotchlock connector (!) and make sure your connection is weatherproof.
In order to avoid cutting into the insulation of the original horn wiring,
I suggest you make up an inline connector that plugs into the female side
of the connector to split off the (+) feed to the grips and the horn,
and passes the switched ground from the horn switch to the horn.

[Must use fixed-width font to view this]

Original wiring Horn conn. Splice
----------< to heated grip switch
(+)--------------------<-------<
----------< to horn
(from horn switch) ----<------------------< to horn
............................................................
(earth lug on frame)----------------------< to heated grip return

 

Whatever method you use to tap into the horn (+) feed, don't use a

Thanks again, what _should_ I use (are the Scotchlock connectors like the
white plastic ones that clip together that it came with?)

Where might I get the makings for connectors from? I'm not much of a DIY man
and don't have any to hand.

 

Use the feed to the front brake light switch.

Thanks, I'll see if that looks easier than the other suggetsions, Suzuki do
make their own heated grips and they must have thought about wiring them in
with minimum effort.

 

These are Scotchlok (sorry I misspelled them originally):

http://www.george-michael.org.uk/acatalog/Cable_Connectors.html

Again, don't use them.

You'll have to go to Maplins or perhaps Halfords or any place that sells
standard crimp terminals. If you do use the horn connector to grab the
+12V feed, you can tap into it with a standard male spade lug and feed
back to the horn itself with a standard female spade. Where you do the
Y-connection that can be done with a normal crimp butt splice.

Typically you can buy a kit consisting of a crimping tool (looks like a
sort of pliers with holes for stripping wires and different gaps in the
jaws for crimping different sized splices and terminals), and a sampling
of various types and sizes of crimp connectors. Said kit should be
quite cheap, 5 quid or so.