Description
31670002 Position Light for Trucks
The 31670002 Position Light for Trucks is Proplast’s Monopoint II LED marker lamp — a 24V white position light built for commercial vehicles running without a holding frame mount. At [client to add price], it ships with a 3.5-metre cable and delivers clean, consistent LED output where the original unit has failed, faded or been physically damaged. If your cab or body position lamp is dark at roadside — this is the replacement to fit.
Proplast’s Monopoint II range is well established across European haulage fleets. The 31670002 LED cab light assembly covers the 24V systems standard across heavy trucks, and the 3.5m cable handles body and trailer mounting positions where shorter runs simply don’t reach the loom.
What Is the 31670002 Position Light for Trucks?
It provides a white position light function — the static marker illumination required by UK and EU regulations for trucks operating on public roads. This unit fits without a holding frame, making it the correct specification for direct-body or surface-mount applications.
How the Position Light Works
The LED array draws power through the 3.5-metre pre-wired cable from the vehicle’s position light circuit. Unlike filament marker lamps, LED units activate instantly with no warm-up period and maintain consistent light output throughout their service life. At 24V, the LED array operates within a precisely controlled current envelope — producing stable white illumination without the thermal fluctuation that degrades filament alternatives over time. The frameless design seats directly against the mounting surface, with the cable routed to the nearest loom connection point.
Why Truck Position Lights Fail
Physical impact is the most frequent cause — position lights mounted on cab corners, roof lines and body edges absorb knocks from overhead obstructions, branches and loading bay structures. UV degradation yellows and crazes lenses over time, reducing light output below legal thresholds even when the LED itself still functions. Water ingress through a degraded seal corrodes the internal connections silently — the unit looks intact from outside until it stops illuminating entirely. On remanufactured-spec fitments, worn mounts and degraded seals accelerate all three failure modes simultaneously.
31670002 Position Light for Trucks — Full Specifications
| Specification | Detail |
|---|---|
| Part Number | 31670002 |
| Manufacturer | Proplast |
| Product Line | Monopoint II |
| Light Design | LED |
| Voltage | 24V |
| Light Colour | White |
| Light Function | Position light |
| Cable Length | 3.5m |
| Holding Frame | Without holding frame |
| Condition | Remanufactured |
| EAN | 4025091300743 |
31670002 Position Light for Trucks — Compatibility
The Proplast Monopoint II truck position lamp operates on 24V systems — the standard voltage for heavy commercial trucks across the UK and EU. Do not connect this unit to a 12V circuit. The LED array is voltage-specific and will not deliver correct light output outside its rated operating range.
Confirming Fitment
Confirm your mounting position requires a frameless fitment before ordering — if your existing installation uses a holding frame bracket, you need the holding-frame variant of the Monopoint II range instead. Measure your cable routing distance from the mounting point to the loom connection and confirm the 3.5m cable reaches your specific installation. Check the mounting aperture dimensions against the Monopoint II footprint on your bodywork.
Cross-Reference Table
| Reference Type | Number |
|---|---|
| Proplast Part Number | 31670002 |
| Use Number | 31670002 |
| Product Line | Monopoint II |
| EAN | 4025091300743 |
When and Why to Replace
31670002 Symptoms — What to Watch For
Position light completely dark. The vehicle’s lighting circuit energises — other markers illuminate — but the Monopoint II side position light at this position is dead. Terminal corrosion inside a water-ingressed housing or a failed LED array. The 31670002 white position light unit is the direct replacement.
Visibly damaged or yellowed lens. A cracked lens or UV-degraded housing scatters light output and reduces forward projection below the threshold required for roadside visibility compliance. Even if the LED still fires behind it, a visibly compromised lens is a testable defect under DVSA inspection criteria.
Intermittent output on the position light circuit. The lamp illuminates on some journeys and not others — typically worse in cold or wet conditions. A partially corroded connection inside the housing that makes contact intermittently. It will fail completely. Replace before it becomes a roadside enforcement issue.
Fix Truck Position Light Fault — Replace the 31670002
There is no repair path for a corroded LED housing or degraded lens assembly. The Proplast 31670002 marker lamp replaces the complete unit — pre-wired, pre-assembled, ready to connect. Drop it into the mounting position, route the 3.5m cable to the loom, connect, and test. Done.
Why Choose the 31670002 Position Light for Trucks?
Monopoint II LED Design — Built for 24V Heavy Trucks
The Monopoint II is not a generic marker lamp. Proplast engineer this range specifically for the 24V operating environment of heavy commercial vehicles — where voltage stability, thermal performance and cable routing requirements differ materially from light commercial applications. According to Proplast’s official product specifications, the Monopoint II range meets relevant ECE approval requirements for position lighting on commercial vehicles operating across EU member states and the UK.
3.5m Cable for Flexible Body and Trailer Mounting
At 3.5 metres, the pre-wired cable reaches loom connection points on extended bodywork, trailer front walls and high-mounted cab roof positions where shorter cables leave the installer short. That reach eliminates the need for loom extensions and the additional connector joints that create future fault points. One cable run. Clean installation. No joins in the circuit.
Remanufactured to Specification — Compliant for Road Use
This unit is supplied in remanufactured condition — rebuilt to original specification and suitable for road use on UK and EU roads. For UK operators, the DVSA MOT Inspection Manual for HGVs lists position lamp function and condition as testable items. A remanufactured Proplast unit built to spec passes that test. A worn, cracked or non-functioning original does not.
Buy 31670002 Position Light for Trucks Online
In stock and shipping today. The Proplast Monopoint II truck position lamp is available for immediate despatch across the UK and EU. Remanufactured to specification, pre-wired at 3.5 metres, ready to fit. Order now and resolve the fault before your next vehicle inspection or pre-departure check.
Installing the 31670002 Position Light for Trucks
Step-by-Step 31670002 Fitting Guide
- Isolate the vehicle’s electrical system fully before starting any work.
- Remove the failed position light unit from the mounting position — retaining screws or clips depending on body type.
- Disconnect the wiring connector from the existing unit and remove it completely from the mount.
- Offer up the new Proplast 31670002 marker lamp to the mounting aperture — confirm the frameless base seats flush against the mounting surface.
- Route the 3.5m cable to the vehicle loom connection point — secure the cable run with appropriate clips at regular intervals to prevent chafing.
- Connect the cable to the vehicle loom — confirm polarity, as LED circuits are polarity-sensitive and will not operate if reversed.
- Secure the unit to the mounting surface with the retaining fixings.
- Restore vehicle power and confirm the 31670002 white position light unit illuminates correctly with the position light circuit active.
FAQs
Is the 31670002 suitable for 12V trucks? No. This unit is rated for 24V systems only. Connecting it to a 12V circuit will produce incorrect light output and may damage the LED array. For 12V applications, confirm the correct voltage variant from the Proplast Monopoint II range.
Does the 31670002 come with a holding frame? No. This part is supplied without a holding frame — it is specified for direct surface-mount or frameless body installations. If your existing fitment uses a holding frame bracket, you need the holding-frame variant. Confirm your mount type before ordering.
What is the cable length on the 31670002? The unit ships with a 3.5-metre pre-attached cable. Measure your routing distance from mount to loom connection before ordering — particularly on high-roof or extended-body vehicles.
What does remanufactured condition mean for this unit? The 31670002 is supplied remanufactured — rebuilt to original Proplast specification using reconditioned components. It is fully functional and road-legal for UK and EU use. Remanufactured does not mean second-hand or untested.
