Sprint ST Dual Star Heated Grips Install

[3banger]

I just installed Dual Star heated grips on my ST.  The installation is strait forward and there are many tutorials out there for Dual Stars.  But I figured I post about a few of the details when doing this on ST.

If you remove the pass switch on the left hand switch housing you have room to fit the round rocker switch in the his housing.  This makes for a very clean installation.  Since in the day time I ride with high beams on the pass switch was of know use to me plus flashing your high beams at a car you intend to over take seems to produce a rather random out come.  I traced out the diameter of hole I would need with a scribe and then trimmed it out with a Dremel, test fitting the switch as I went.  Much safer then trying to drill a hole that large in a piece of plastic.

Left Side


Right Side



The empty three wire plug under the nose fairing is intended for the factory heated grips.  I cut of the plug and wired into the power here.  There are three wires, 12v hot, 12v signal, & Ground.  The 12v hot use the fuse in the fuse box marked for the heated grips but remains hot even when the bike is off.  So I wired in a 12v relay using the signal wire to switch the 12v hot with the ignition.  This will prevent dead batteries if I leave the heated grips on or if a passer by feels the need to flip switches on my bike; it’s happed before!  You will be able to tell which is the 12v hot and 12v signal by pulling the heated grip fuse and seeing which wire remains hot.

Relay

[Montyburns]

That looks great.  I wish I'd thought of that location for my switch.  

[rselin]

The Triumph heated grip circuit switches off with the ignition, so if your 12 V wire stays hot with the ignition off, you wired into the wrong circuit.

[TheRedOnesAreFaster]

One wire is always hot, although no current flows past the relay until the 12v signal line activates the relay.  Then the hot wire passes its current through to the grips via the other post of the relay's switch.

Or so I remember from wiring up my grips.

[3banger]

Yes, I believe RedOne is correct.  I assumed when measuring voltages and stuff at the three wire connector that the factory heated grips must come with a relay?  I just used a 12v 10amp relay from radio from RadioShit.

[TheRedOnesAreFaster]

...I assumed...that the factory heated grips must come with a relay?

Yes, it does.

I also used a RS relay when I added my gadgets.  Works great.

[rselin]

My bad.  I thought the relay would be upstream of the connector.  Never realized it was part of the grip kit.

[TheRedOnesAreFaster]

My bad.  I thought the relay would be upstream of the connector.  Never realized it was part of the grip kit.

We all learn something new every day!

[alphabet man]

Thanks for the tip I origanly wired mine directly to the switched 12V source, I didn't want to risk flattening my battery, the grips didn't get very hot and took a long time heating up, added a relay last night and SHAZAM way way better  

 Thanks

[Clive]

The Triumph heated grip circuit switches off with the ignition, so if your 12 V wire stays hot with the ignition off, you wired into the wrong circuit.

I thought there were two empty jacks: one for the heated grips and one for the Triumph GPS/navigation unit.  I know the latter's socket is always-hot.