07/04/2026
**Heads up for Triumph MK1 speed triple, thunderbird 900 and MK2 trophy owners!**
It's taken a while, but I've finally got the parts together for a batch of the temp warning light mod. it seems this combination of temperature trigger point and thread size is very rare, and I've ended up having to order these from France! Which has then taken that supplier about a month to source and get to me!
So, for those that aren't up to speed, what is the temp warning light mod?
The high temp warning light on the speed triple, thunderbird and MK2 trophy uses the same variable temp sensor in the head as the T300 models equipped with a temperature gauge, so they are fitted with a little PCB in the headlight shell that converts the variable voltage feed from the sensor to an on/off signal for the warning light.
As standard, there is no startup test cycle to check the operation of the bulb, and as the pcb's are now getting old, corrosion takes hold and you have no way to actually test the circuit is functional, which could mean your engine overheats catastrophically before you know about it.
So I have sourced a 110⁰c temperature switch that replaces the sensor and PCB, with the addition of a new PCB that gives you a 10 second test of the temperature warning light on the clocks Every time the ignition is turned on.
I can offer this as a DIY kit with instructions, but it does require cutting the old PCB out of the loom and wiring in the new one (🚫 it's is NOT a straight like for like swap! 🚫) and with the condition of the old loom you may need to take out quite a lot of the original temp warning light wiring to replace them with fresh wire to enable patching in the new loom, so I really do recommend sending your loom in to have the modifications and potential repairs made (cost will be the same regardless of how much repair is required)
I will have 10 kits available as of tomorrow, first come first served. If there is enough interest I will source more temp switches.
Price wise, it's going to be:
DIY kit: £50 Inc temp switch, start up test PCB with instructions and UK postage
fitted, £110 Inc all parts, labour, potential loom repairs and UK return postage.
