Bump start a car with no battery?

[GreenV8S]

Berw said:

May be theoretically possible but it doesn't work in practice.

A typical alternator without any excitation current might just self start if you're lucky and manage to get it up somewhere near the red line, but your chances of that while bump starting the car are nil.

[braddo]

Chris32345 said:

At imboliser is always active
It needs to be energised to turn it off

Or else they would be too say to bypass

My Caterham is 90s vintage so the immobiliser needs to be activated mnaually (button on key fob). I suppose as long as it is activated before the battery goes dead, the immobiliser is active when the battery is reconnected. Therefore it's no easier to steal with a missing battery, which was my original question.

When I put the battery back in last weekend it did take a few attempts to turn off the immobiliser and get it started.

[lexusboy]

Slightly off topic but a while ago I removed a battery from a sales car to put on charge in the workshop over the weekend.

I come in on Monday to refit the battery and notice the car has moved but the battery is still attached to the charger in the workshop.

I’m getting heavily confused at this point and ask the sales staff if anyone has used the car over the weekend.

Turns out they jump started it off the jump posts under the bonnet as they assumed it was flat and drove it for approximately 10 mile round trip to our compound without a battery in the car. I was astounded that the car was running without a battery being in the car let alone just not connected

[anonymous-user]

lexusboy said:

Slightly off topic but a while ago I removed a battery from a sales car to put on charge in the workshop over the weekend.

I come in on Monday to refit the battery and notice the car has moved but the battery is still attached to the charger in the workshop.

I’m getting heavily confused at this point and ask the sales staff if anyone has used the car over the weekend.

Turns out they jump started it off the jump posts under the bonnet as they assumed it was flat and drove it for approximately 10 mile round trip to our compound without a battery in the car. I was astounded that the car was running without a battery being in the car let alone just not connected

some cars have 2 batteries, a know merc Clk did.