90 Electrics

Tell me.... When I remove the negative lead from the battery when the engine is running it cuts out!!!! Why? I am assuming it is becaues of the fuel shut off on the injector pump, but surely the alternator should supply the current once running. Do I have a problem or is this how it is!? I can not be sure it is the fuel shut off by the way... just a guess.

:wtf: :hysterically_laughi :hysterically_laughi :hysterically_laughi :hysterically_laughi :hysterically_laughi

Put a mates battery in the other day to get it started. When tried to swap when running it stalled!!! Could not swap it!! Thoughts?

I only found this out the other day, the alternator needs power to genarte power

presume ya motor hasnt got a ecu...

So in summary... It is normal???

Yes

ratty said:

Yes

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awwww i was going let him stew a while

iannotts said:

awwww i was going let him stew a while

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pssst. You could always say I'm wrong.

thats just nasty

my n/a would run with the battery disconnected

discojamz said:

my n/a would run with the battery disconnected

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ah my n/a will too ah think only earlier n/a's with the 45amp lucas alternator will run (correct me if am rong) i think as nothing else is powered off the alternator , the 300 tdi dunt run wi out battery tho, cant swap when started with other battery

I think the older lucas alternators could generate their own excitor voltage (required to generate) but i rekon the newer ones need a battery in circuit, cos they has fancier electroncery in them.


Could be talking bollocks though.

I do know its not good for an alternator to run it with no battery in circuit though.

My old Mini used to run with the battery off as long as the revs were up.

I was always told it would knacker the alternator if you ran it without a battery connected.