It’s a 2017 MultiStrada 950, in for new tyres but the customer also pointed out his tail light and reg plate light have stopped working, brake lights are fine but no tail light.
He bought one of these ST2 brake module gizmos and attempted to fit it.
It fits by piggy backing onto the stop light wire, a power supply wire and a ground wire, like so
Using clips like this
The clips cut through the insulation on the target wire leaving the wires like this if removed
You’ll see he spliced into 2 yellow wires but that’s because he got the first wire wrong - it feeds an indicator not the tail light.
The red/white (it’s actually red/grey) wire is the stop light wire; the black is the ground. Thus it’s not as though he wired it in incorrectly but since attaching it he’s had no tail light or Reg plate light. Indicators & brake lights still work.
The tail light is a non-serviceable LED unit that has to be completely replaced if it malfunctions, cost is £198.85 plus another £40 for the reg plate light
.
The workshop manual is not very helpful it simply says if the tail light is not working replace it with a new unit.
The tail light is not that straightforward, it gets it’s power from the BBS and is controlled by the BBS such that it only comes on when the engine is running or has been running.
Has anyone had any experience with a similar issue of the tail light not working? The wires are intact just broken insulation. Or any ideas how to test it before telling him he’s got to fork out for a new unit?
As it’s LED I’m wondering if connection of the ST2 module has blown any resistors or diodes within the light unit
He bought one of these ST2 brake module gizmos and attempted to fit it.
It fits by piggy backing onto the stop light wire, a power supply wire and a ground wire, like so
Using clips like this
The clips cut through the insulation on the target wire leaving the wires like this if removed
You’ll see he spliced into 2 yellow wires but that’s because he got the first wire wrong - it feeds an indicator not the tail light.
The red/white (it’s actually red/grey) wire is the stop light wire; the black is the ground. Thus it’s not as though he wired it in incorrectly but since attaching it he’s had no tail light or Reg plate light. Indicators & brake lights still work.
The tail light is a non-serviceable LED unit that has to be completely replaced if it malfunctions, cost is £198.85 plus another £40 for the reg plate light
. The workshop manual is not very helpful it simply says if the tail light is not working replace it with a new unit.
The tail light is not that straightforward, it gets it’s power from the BBS and is controlled by the BBS such that it only comes on when the engine is running or has been running.
Has anyone had any experience with a similar issue of the tail light not working? The wires are intact just broken insulation. Or any ideas how to test it before telling him he’s got to fork out for a new unit?
As it’s LED I’m wondering if connection of the ST2 module has blown any resistors or diodes within the light unit
. At least now I know it’s not the light unit. Just got to work out why there’s no signal for the tail light from the BBS to the light unit 
. I’m now thinking it’s had a detrimental affect on the BBS unit 
... How many hours a week are you doing now 
