v85tt heated grips failure question?

[L.A. Nomad.........]

I have a 2020 V85TT with 36,000 miles. Last spring my heated grips stopped working, one failed before the other on the same ride day. Question, is it normal that both fail together? Or should I look else where, the fuses look fine.

Thank you!

[Kiwi_Roy]

Did the right grip fail?
If so that could be the wires breaking with constant flexing as the throttle is twisted.
https://www.thisoldtractor.com/guzzi007/schematics/2019_V85_TT.gif Yhe grips are item (11)
Im sure its possible to troubleshoot, try poking a sewing pin into the wire, this will allow you to check the element from the pin to chassis.
Check with your multimeter that the bars are grounded, if not run a separate ground wire.
The bars on my V7IIISpecial were not grounded but I was able to add a short jumper connecting the bars to chassis.

[guzziart]

Check with your multimeter that the bars are grounded, if not run a separate ground wire.
The bars on my V7IIISpecial were not grounded.

If true, what an electrical engineering achievement to save a couple cents, create a ground path through the bars, clamp & head bearings to get back to the frame ground, brilliant (sarcasm).  I seem to recall Honda doing someting similar but they included some sort of spring loaded contactor from the frame to the lower clamp so current would flow through the Hbar, clamp & stem but not the stem bearings.

Anyway, hopefully your grip problem is something simple but a wire break in close proximity of the twist grip is likely the problem imho.  It's probably not a bad idea for all of us with heated grips to check that area to make sure the heated grip wiring isn't stressed in closed and WOT range.  The wiring to the heated twist grip on my Wing eventually failed because when the bike was assembled there wasn't sufficient slack in the wiring throughout the rotational range of the grip.  I wasn't bright enough to realize the situation until after the failure.  Oh well, it's only money.

Art

11/3/24 Update... After some thought, I believe the switchgear on my '87 LMIVSE grounds through the hbar.  I recall cleaning something in the sw. housing that contacts the bar.

[L.A. Nomad.........]

Both heated grips no longer heat up(zero), one failed before the other 10 mins from home on a rainy freezing day. I see the 3 icon bars work on my speedo screen when I hit the "on" button. The bike has tipped over multiple times and few low speed drops too.(Factory crash bars work very well!). My grips have had a tough life.

I happen to have some Oxford retro style heated grips a friend left at my garage, so I ordered the molex pins.

But my question is if one grip fails, do both sides stop working?

Thanks

[guzziart]

Both heated grips no longer heat up(zero), one failed before the other 10 mins from home on a rainy freezing day. I see the 3 icon bars work on my speedo screen when I hit the "on" button. The bike has tipped over multiple times and few low speed drops too.(Factory crash bars work very well!). My grips have had a tough life.

I happen to have some Oxford retro style heated grips a friend left at my garage, so I ordered the molex pins.

But my question is if one grip fails, do both sides stop working?

Thanks

IDK, on my Wing they were connected in series so, if one fails (goes open circuit) the good one will not function either. 

Power to the grips come from #1 & #10 of the instrument panel ( coutesy of  https://www.thisoldtractor.com/mg_manuals/wiring_diagram_v85-tt-e5plus_en.pdf)   I have no idea where they go to ground, sorry.  Hopefully someone wil be along shortly to comment.

[Moparnut72]

If you use the Oxford grip and they come with the controller use it. Connect it directly to the battery. They shut off automatically, the controller is easy to use and has if I remember correctly five settings. The controller isn't very big and can be installed fairly out of the way on the bars. I've had them on three different bikes, they are much warmer than the Guzzi ones. I didn't put them on my Mandello as I now have heated gloves which are better overall at least for me.
kk

[L.A. Nomad.........]

update 11/13/24 the wires going to throttle handle broke. I had a spare set of retro Oxford heat grips laying around. I cut and used the old harness connectors. the clutch side was easy (my clutch side stock heated grips had two small screws). I used a razor to cut off the throttle grip and peeled the heated element/adhesive. I had to reem out the new oxford grip with a Dremel.( inner diameter). My V85 was an early model 2019/2020, so it may differ from later models. Personally I think the Oxford grip splits as it slides on the old Guzzi plastic grip. regardless it still worked. I'm good for winter. 

[Kiwi_Roy]

I happen to have some Oxford retro style heated grips a friend left at my garage, so I ordered the molex pins.

But my question is if one grip fails, do both sides stop working?

Thanks

They won't both fail, they have a dedicated circuit from the Dash 1 & 10 to item 11 and the drawing shows a separate ground (chassis connection)
https://www.thisoldtractor.com/guzzi007/schematics/2019_V85_TT.gif
Grip heaters and clothing heaters work by switching 12 Volts from the battery ON, OFF, ON, OFF
When you turn the heat up they spend a longer time tuned ON