Cigarette lighter or battery clamps tyre inflator
Updated: 21.10.2026
The socket has just gone dead in a UK car park, or the listing in front of you says 20 A and still puts a cigarette-lighter plug in the box. A cigarette lighter or battery clamps tyre inflator is a question of whether the accessory fuse can feed the pump, or whether the pump has to go on the battery posts. The [12V air compressor comparison](/hub/compressors/12v-air-compressor) is the table for the nine amazon.co.uk listings kept on 19 October 2026. This page is only the plug. If the real problem is a motorhome pressure, the van page is the next stop. We have not measured current on a car. A qualifying amazon.co.uk purchase can earn us a commission at no extra cost to you.
The socket has just gone dead in a UK car park, or the listing in front of you says 20 A and still puts a cigarette-lighter plug in the box.
The socket has just gone dead in a UK car park, or the listing in front of you says 20 A and still puts a cigarette-lighter plug in the box. A cigarette lighter or battery clamps tyre inflator is a question of whether the accessory fuse can feed the pump, or whether the pump has to go on the battery posts. The 12V air compressor comparison is the table for the nine amazon.co.uk listings kept on 19 October 2026. This page is only the plug. If the real problem is a motorhome pressure, the van page is the next stop. We have not measured current on a car. A qualifying amazon.co.uk purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Connection | Stated draw | Auto shut-off | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  AstroAI AstroAI 12V digital tyre inflator | Cigarette-lighter plug | 100 W | Yes | 8.7 | about £17.99 | View offer |
| Alternative |  GSPSCN GSPSCN 12V dual-cylinder inflator | Clamps and a socket lead | 20 A, 240 W | Not stated | 8.3 | about £54.99 | View offer |
| Alternative |  Amazon Basics Amazon Basics 12V dual-cylinder inflator | Battery clamps | Reviewer comment near 20 A | Yes | 6.0 | about £56.99 | View offer |
On this page
What the cigarette lighter can feed
The cigarette-lighter socket is an accessory circuit. The fuse in the handbook protects the wire behind the dashboard. It does not advertise how hungry a pump may be. There is no single UK figure that covers every car. Owners on a PistonHeads thread compare inflator current with a 15 A socket and warn that a larger fuse does not make the wire thicker. Treat 10 A or 15 A as a rule of thumb and read the fuse chart for your own vehicle. A Michelin manual for a different 12V inflator shows a 10 A or 15 A glass fuse in the plug itself. There can be a fuse in the lead as well as one in the fuse box.
On this shelf the socket pumps are the toptrek, the GROBOE, the AstroAI and the AA. The AstroAI listing states 100 W. That is a power figure, not a measured current, and the other three do not state amps at all. You cannot turn a wattage into proof that your fuse will hold. Parkers’ advice for this kind of pump is to keep the engine running, so the alternator helps the battery while the compressor runs. A short car top-up on a live socket is what those four are for. A pump whose listing current is already in the tens of amps is a different tool, even if a cigarette-lighter lead is in the bag.
What the clamps change
Battery clamps bite the posts and take current from the battery and, with the engine running, from the alternator. They skip the accessory fuse that killed the socket. They do not create power. If the battery is too flat to turn the starter, a clamp pump has the same empty source. This page is not a jump-start guide.
Two listings in the set are built for that connection. The Amazon Basics dual-cylinder inflator is clamps, not a cigarette-lighter plug. One reviewer puts its draw near 20 A, which is a comment rather than a spec row. The GSPSCN lists 20 A and 240 W, and the box includes both a 3 m cigarette-lighter lead and battery clamps. Products Compared has not measured that 20 A. It is what the listing states. One UK reviewer of the GSPSCN says not to use the socket lead. Prefer the clamps on that pump unless the handbook already shows that the socket can cover the draw.
Out and About Live describes a Ring RAC900, which is not in this set, drawing 23 A and shipping with clamps because most cigar sockets cannot cope. That is type evidence, not a test of the GSPSCN or the Amazon Basics. A cordless pack sits beside this fork: it avoids the car fuse, and it avoids a flat car battery only while its own pack is charged. The 12V tyre inflator buying guide sorts that third option from the plug.
How to choose for this car
Use the socket when the pump is one of the light digital inflators and the handbook fuse can feed it. Use clamps when the listing current is in the tens of amps, which on this shelf means the GSPSCN at a stated 20 A and the Amazon Basics. The condition is the handbook, not the badge on the box. A routine car top-up, with a placard around the mid-thirties in psi, is the socket job.
The comparison’s top pick for a car with a live 12V socket is the AstroAI, and that pick does not extend to a van tyre. The best value socket pump in the same table is the GROBOE, on a much thinner review file. Neither sentence changes the fuse. If your last socket pump already blew the fuse, buying another light inflator does not fix the wire. If the plug is fine and the pump will not reach a motorhome placard, pressure and hose length belong on the 12V tyre inflator for a van page.
If the fuse has already blown
A dead socket after an inflator is a familiar UK complaint. ATO ATC’s account is the practical one: find the fuse the handbook names for that socket, replace it like for like, and stop if the new fuse blows. Do not fit a 20 A fuse because the pump says 20 A. The wire was sized to the original fuse. A bigger fuse leaves the loom unprotected.
Check the small fuse in the plug as well. The Michelin manual is not your car’s chart, but it shows why a lead can look intact while the glass fuse in the plug is open. If the correct fuse blows again, or the plug is warm, melted or discoloured, stop and call an auto electrician. Do not keep trying the pump, and do not bypass the fuse. The inflator is the wrong tool for diagnosing a loom.
Common questions
Why did the socket die?
The accessory socket is fused for the car’s own wiring. A tyre inflator can draw more than that fuse for long enough to open it, which is the pattern ATO ATC describes after a 12V compressor. The fuse did its job. Replacing it with a higher rating does not repair the mismatch. Read the handbook for the fuse that belongs in that socket.
Can I fit a 20 A fuse if the pump says 20 A?
No. A 20 A figure on a listing is the pump’s stated draw, not permission to uprate the car. The GSPSCN listing states 20 A, and Products Compared has not measured it. If your handbook fuse is lower, use the battery clamps that come with that pump, or choose a socket inflator the existing fuse can feed. If a like-for-like fuse blows a second time, stop.
Which listings use a socket, and which use clamps?
The toptrek, GROBOE, AstroAI and AA are cigarette-lighter pumps. The AstroAI states 100 W, which is still not a measured amp, and the other three do not state amps. The Amazon Basics unit connects with battery clamps. The GSPSCN includes both a 3 m socket lead and clamps, and it lists 20 A, so prefer the clamps unless the handbook already covers that draw.
The GSPSCN includes both leads. Which one do I use?
Use the clamps, unless you have checked that the accessory socket in your handbook can supply a pump listed at 20 A. One reviewer of this listing says not to use the cigarette-lighter lead, which fits the stated current. The 3 m socket lead in the box is not a free pass. The listing figure is the evidence, not a lab result from this comparison.
Do clamps work if the battery is flat?
Clamps need a battery that can still supply the current. With the engine running they can draw through the alternator as well. A battery that will not start the engine will not run a heavy inflator either. Clamps avoid the accessory fuse. They do not avoid a flat battery. A cordless inflator avoids the car battery only while its own pack holds a charge.
When do I stop and call an auto electrician?
Stop when the correct fuse blows again, when the plug or socket smells hot or looks melted, or when the socket stays dead after a like-for-like fuse and a sound plug fuse. Do not fit a larger fuse to finish the inflation. Wiring behind the dash is an auto electrician’s job. A tyre that is cut or bulging is a tyre fitter’s job, not an electrical one.
Related pages
Sources
Public UK sources first. amazon.co.uk listings for the nine ASINs checked on 19 October 2026.
- Construction and Use Regulations 1986, regulation 27 (retrieved 19 October 2026)
- Highway Code annex 6: vehicle maintenance, safety and security (retrieved 19 October 2026)
- TyreSafe: car tyre pressure (retrieved 19 October 2026)
- TyreSafe: tyre pressures explained (retrieved 19 October 2026)
- General Product Safety Regulations 2005 (retrieved 19 October 2026)
- ATO ATC: 12V socket dead after a tyre inflator (retrieved 19 October 2026)
- Parkers: tyre inflator compressors (retrieved 19 October 2026)
- amazon.co.uk listings for the nine ASINs (retrieved 19 October 2026)