Winter Tractor Lighting Checklist: Work Lights, Beacons and Bulbs
In this guide
The winter tractor lighting checklist is a full check of every road lamp, lens, beacon, work light, trailer light and plug, plus the battery and charging system, done before the dark evenings arrive. In New Zealand the clocks go back on the first Sunday in April (next on 4 April 2027), so from that week the drive home from the field happens in the dark, and the darkest months are June to August. Allow 20 to 40 minutes per tractor and 15 minutes per trailer.
This guide gives you the checks in order, a printable style check table, and the spares worth carrying in the cab until spring.
Why the Dark Nights Check Matters
When the clocks go back, sunset moves an hour earlier overnight. In New Zealand, daylight falls from around 14 to 16 hours in late December to around 8.5 to 10 hours in late June, depending on how far south you farm. Work that finished in daylight in March now ends on the road after dark, often in rain, with mud on the lenses.
The law is simple. Under the Land Transport Rule: Vehicle Lighting 2004, the lamps a tractor or self-propelled machine is required to carry must be fitted and working on a public road, and headlamps and rear lamps must be on during the hours of darkness, which in general run from half an hour after sunset to half an hour before sunrise. In winter that covers most of the evening run home. A missing or faulty lamp can mean an infringement fee from Police. See NZ Transport Agency Waka Kotahi’s agricultural vehicle guidance for the full list for your machine.
Winter also raises the failure rate. Cold starts and short runs work batteries harder. Rain and condensation get into cracked lenses and connectors. Yard muck, effluent and coastal salt corrode pins and earths, adding resistance until lamps go dim, flicker or fail. Finding those faults in the yard in April is quicker and cheaper than finding them on a dark rural road in July.
The Dark Nights Check, Step by Step
Work through the stages in this order. Each one sets up the next.
1. Clean Every Lens
Wash the vehicle or at least every lamp first. A muddy lens cuts light output badly, and you cannot judge output or spot cracks through a layer of mud. Use a soft brush and water, not a pressure washer jet at close range on old seals.
2. Inspect Lenses and Housings
With the lamps off, look at every lens for cracks, chips, missing pieces, crazing and heavy yellowing. Check the seal between lens and housing. A lens with a crack lets water in, and water inside a lamp means a short life for both bulbs and LED drivers. Replace the lamp rather than taping it.
3. Function Test Every Lamp
Park facing a wall or a shed door so you can see the front lamps on the reflection, and use a helper at the rear. Test each function in turn: front position lamps, dipped beam, main beam, indicators (front, side and rear), hazard warning lamps, rear position lamps, brake lamps, rear fog lamp, reversing lamps, number plate lamp, beacon and work lights. Note each failure as you go.
4. Replace Failed Bulbs, in Pairs
Replace failed bulbs and any that show darkened glass or a sagging filament. Fit headlamp bulbs in pairs so both sides match in colour and output. Do not touch the glass of halogen bulbs with bare fingers. If bulbs keep failing on the same lamp, look for a cause such as vibration, a loose bulb holder or a high charging voltage.
5. Clean and Protect Connectors
Pull apart each accessible connector. Look for green or white corrosion, loose pins and water. Clean with contact cleaner and a small brush, then apply a light coat of dielectric grease before reconnecting.
6. Check the Earths
Find each lighting earth point, usually on the chassis or cab near each lamp cluster. A loose or corroded earth causes dim lamps, flickering and lamps that work only when the indicator is on. Clean to bright metal, refit with a serrated washer, and protect the joint.
7. Check Headlamp Aim
A front loader, a heavy linkage implement or a front weight block changes the angle of the tractor, and with it the aim of the headlamps. With the tractor in its usual road set-up, check that dipped beams point down and to the left and are not dazzling oncoming drivers. Our guide to headlamp alignment for tractors explains how to set them.
8. Test on the Move
Drive slowly round the yard with a helper watching. Some faults only show when the tractor is moving, vibrating or under engine load, such as a loose connector or a chafed cable at a cab mount.
Beacons and Warning Lights
In New Zealand an amber warning beacon is required on agricultural vehicles in a range of road situations, such as oversize or slow-moving operation, so check NZTA Waka Kotahi’s agricultural vehicle guidance for your machine. Where your tractor needs one, a dead beacon is a road fault, not a nice-to-have, so check it as carefully as the headlamps. Our guide on beacon rules covers the detail.
- Visibility. Switch on, walk round the tractor at a distance and confirm the flash is visible from every side. Check that loaders, bale handlers and mounted kit do not block it.
- Mount. Check the pole, the socket and the fixings. A loose pole rattles until it breaks. A cracked socket lets water into the roof wiring.
- Cable. Trace the beacon cable back to the switch. Look for chafing at the roof edge, door seals and cab pillars.
- Halogen rotators. Weak flash, slow rotation or a noisy motor are signs of a worn unit. Replacing it with an LED beacon removes the bulb and motor from the list of things to fail.
Browse LED tractor beacons if yours is due for replacement.
Work Lights
Work lights are not road lamps, but in winter they do most of the work in the yard and the field. They also take the most damage, sitting on the cab roof at branch height.
- Check each lamp works and is aimed where you need it: hitch, linkage, loader bucket, wheels.
- Look for cracked lenses, condensation inside and broken brackets.
- Check the switch, relay and fuse for each work light circuit.
- Make sure work lights can be switched off for road travel. Work lamps are for off-road work and should be switched off before using the public road, and white light must not be shown to the rear while driving, apart from reversing and number plate lamps.
Old halogen work lamps that are dim, cracked or full of water are the obvious LED upgrade. LED lamps draw much less current, which also helps the battery on short winter runs. See our tractor LED work lights.
Trailer Lights and Plugs
Trailers spend the winter outside, get washed often and take spray from the wheels, so they need the same 8 stages as the tractor plus 3 more checks.
- The plug and socket. Open both, brush out dirt, clean the pins and apply a little dielectric grease. Check the socket on the tractor too, and fit a cover if it has lost its flap. Replacement 7-pin plugs and sockets are cheap compared with a wasted trip.
- The loom. Check the cable at every hinge, pivot, drawbar and tipping body joint, where flexing cracks the insulation. Replace damaged sections rather than taping them.
- Every lamp and reflector. Check rear position, brake, indicator and number plate lamps, rear reflectors, and side and end outline marker lamps where fitted. Bulb lamp clusters on trailers can be swapped for LED rear lamps, which cope better with vibration.
If a trailer’s lights are still dead after this, work through our guide to trailer lights not working.
Batteries and Charging
Lighting faults in winter often start at the battery. Cold reduces the power a lead acid battery can deliver, and short runs with lights, heater fan and wipers on may not fully recharge it.
- Resting voltage. With the engine off for a few hours, a healthy fully charged 12V lead acid battery reads about 12.6V. A battery that sits well below that after charging needs testing or replacing.
- Charging voltage. With the engine running, a typical 12V charging system reads roughly 13.8V to 14.4V at the battery. Much lower points to an alternator, belt or wiring fault; much higher can boil the battery and shorten bulb life.
- Terminals and leads. Clean and tighten the terminals, check the earth strap to the chassis, and grease the clamps.
- Load. If you have added lights over the years, check the total load against what the alternator can supply. LED conversions reduce the load considerably.
- Stored machines. Keep batteries on machines that sit for weeks on a maintenance charger.
Our batteries and charging range includes chargers and accessories.
Cab Lighting
Check the interior light comes on and goes off, the instrument lighting works evenly at every dimmer setting, and any reading lamp is working. A dark cab means fumbling for switches at 6am. Replacement interior and reading lamps are a quick fix, and LED units draw very little current.
Spares to Carry in the Cab
A small kit in the cab turns a failed lamp into a 5 minute roadside fix. Check the bulb codes against your own tractor and trailer before you build the kit.
| Item | Quantity | Covers |
|---|---|---|
| Headlamp bulbs (H4 or H7, matched to the tractor) | 2 | Dipped or main beam failure |
| P21W or P21/5W bulbs | 2 to 4 | Brake and tail lamps on bulb clusters |
| PY21W bulbs | 2 to 4 | Indicators with amber bulbs |
| R5W, C5W or W5W bulbs | 2 to 4 | Position, number plate and marker lamps |
| Bulb assortment box | 1 | Anything else, including trailer lamps |
| Blade fuses in the ratings your fuse box uses | A few of each | Blown lighting fuses |
| Test lamp or multimeter | 1 | Finding where the power stops |
| Contact cleaner and dielectric grease | 1 each | Corroded plugs and connectors |
| Screwdrivers, insulating tape, cable ties | 1 set | Lens removal and temporary repairs |
| Head torch | 1 | Working on lamps in the dark |
A ready made bulb assortment box covers most codes in one go, and spare fuses and fuse holders are worth keeping with it.
Printable Dark Nights Check Table
Print this table and keep one per vehicle. Tick each item, note the fault and the fix.
| Item | What to check | OK | Fault and action |
|---|---|---|---|
| Dipped beam (both sides) | Works, matched colour, aimed down and left | ||
| Main beam (both sides) | Works, warning lamp on dash | ||
| Front position lamps | Both work, lenses clean | ||
| Indicators and hazards | All corners and side repeaters, steady flash rate | ||
| Rear position lamps | Both work, red, lenses intact | ||
| Brake lamps | Both work on pedal | ||
| Rear fog lamp (where fitted) | Works, dash warning lamp works | ||
| Reversing lamps (where fitted) | Work in reverse only | ||
| Number plate lamp | Lights the plate | ||
| Rear reflectors and markers | Present, clean, not cracked | ||
| Lenses and seals | No cracks, no water inside | ||
| Beacon | Visible all round, mount secure, cable sound | ||
| Work lights | All work, aimed, brackets secure, switch off for road | ||
| Cab and instrument lights | Interior lamp, dash lighting, reading lamp | ||
| Connectors and earths | Clean, tight, greased | ||
| Trailer socket (tractor) | Clean pins, cover fitted | ||
| Trailer plug and loom | Clean pins, no cracked cable at hinges | ||
| Trailer lamps | All functions with tractor lights on | ||
| Battery | About 12.6V at rest, terminals clean and tight | ||
| Charging | Roughly 13.8V to 14.4V engine running | ||
| Cab spares kit | Bulbs, fuses, tools, head torch |
Upgrades Worth Making Before Winter
If parts are due for replacement anyway, these upgrades make the dark months easier.
- LED work lights on the rear roof. A wide flood beam over the hitch and linkage makes coupling up in the dark quicker and safer.
- LED headlamps or LED rear lamps. Approved LED units remove filament failures. For headlamps, a complete approved LED headlamp unit is the legal upgrade, not an LED bulb in a halogen headlamp; whatever inspection regime your tractor falls under (WoF, CoF or the agricultural vehicle rules), it must be kept roadworthy and road lamps still need to be approved. Make sure any road lamp carries the correct E-mark or another recognised approval, and look at our tractor headlights for replacements.
- An LED beacon on a flexi mount. No bulb, no motor, and the mount bends when it meets a branch.
For year round care of the lighting on your machines, see our tractor lighting maintenance guide. Orders ship from the UK, with free delivery to New Zealand on orders over NZ$500. Prices are in NZ dollars, and any NZ GST, duty or Customs fees are paid on delivery.
Frequently asked questions
When do the clocks go back in New Zealand?
The clocks go back 1 hour at 3am on the first Sunday in April, when daylight saving ends in New Zealand. In 2026 that was Sunday 5 April, and the next change is Sunday 4 April 2027. Sunset moves an hour earlier that evening, so the end of the working day is in the dark from that week.
Is it illegal to drive a tractor with a light not working?
In New Zealand, the lamps your tractor is required to carry must work whenever it is on a public road, and a missing or faulty lamp can mean an infringement fee. Older tractors and tractors used only in daylight can have fewer requirements, so check NZTA Waka Kotahi’s agricultural vehicle guidance, but any lights they have fitted should work.
Which spare bulbs should I carry in a tractor cab?
Carry 2 headlamp bulbs of the type your tractor uses (often H4 or H7), a few brake, tail and indicator bulbs, small position and number plate bulbs, some fuses and a bulb assortment box. Check the codes against your own lamps first.
How often should I check tractor lights in winter?
Do a full check before the clocks go back, then a quick walk round check of road lamps before each road trip. Look again at trailer plugs and lenses after heavy muck or washing, because that is when corrosion and water ingress start.
