Vehicle · Classic
Classic Car Jumpstart, Positive-Earth Aware
Classic car flat battery? Positive-earth aware jumpstart and correct-spec battery fitting across the West Midlands.
Pre-1970 British cars are often positive-earth, clip a modern jump pack on the wrong way and you'll fry the dynamo regulator, the radio or worse.
We check polarity before we clip anything on, carry conventional flooded batteries in the correct terminal orientations, and can charge dynamo-equipped cars safely.
Key facts, Classic cars
- Polarity check
- Always, some pre-70 cars are positive-earth
- Battery type
- Conventional flooded, correct terminal side
- Charging system
- Dynamo vs alternator confirmed before jumpstart
- Common models
- MGB, Mini, Triumph, Jaguar E-Type, Morris Minor
Who calls us for this
Weekend club drivers, restoration owners finishing a rebuild, and buyers collecting a project car with an unknown battery history.
Classic cars, specific questions
Q.Do you jump positive-earth cars?
Yes, with the pack reversed. We always confirm polarity first because doing it wrong destroys the dynamo regulator.
Q.Can you supply a 6V battery for older cars?
Yes, 6V flooded units in both terminal orientations are available on request; call ahead so we bring one.
Q.Is a modern lithium jump pack safe for a classic?
Yes when polarity and voltage are correct. We de-rate the pack for dynamo-equipped cars to avoid stressing the regulator.
What we actually see on these jobs
- Reverse-polarity mistakes are catastrophic on positive-earth cars, we don't guess.
- Weak dynamo charging looks like a flat battery, we can identify the difference roadside.
- We stock conventional 12V and 6V flooded batteries in both left- and right-terminal versions.
Related guides
How the callout works
- 1
One call, one price
Postcode, vehicle and symptom on the phone, you get a fixed price before we set off.
- 2
On-site test
Voltage, load and (where relevant) alternator field test at your location.
- 3
Jumpstart or replace
If it holds, you drive off. If it doesn't, we fit the correct battery from van stock.
- 4
Coded and warrantied
BMS coding included where required, warranty paperwork by email before we leave.
General questions
Q.How quickly can you get to me?
Typically 45 to 60 minutes across the West Midlands from our Oldbury base, faster off-peak and at night when the roads are empty.
Q.Can you invoice on account for businesses?
Yes, 30-day account terms available for fleets, lettings, dealers and repeat trade customers. Single monthly PDF invoice.
Q.Do you take the old battery away?
Yes, proper lead-acid recycling included with every fit, no extra charge, no landfill.
In short
Classics need a thinking hand, not a plug-and-hope jump pack. Polarity, dynamo, correct battery, every time.
Classic flat on a show day? Polarity-aware help on the way.
No fried regulators, no destroyed radios, proper classic-safe procedure.
Stranded with a flat battery?
Call now or send a WhatsApp, we'll confirm your quote and dispatch the nearest engineer.