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removing battery with engine running?

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Tezzy
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removing battery with engine running?

Postby Tezzy » Thu Sep 10, 2009 7:49 pm

I need to get the supra started this evening and the battery has gone flat. Dont have jump leads.

I was going to throw the altezza battery into the supra to start it then swap them over with the engine running. will this do any harm to the supra disconnecting the battery when running?

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GreddRob
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Re: removing battery with engine running?

Postby GreddRob » Thu Sep 10, 2009 7:56 pm

Would it stay running??? I dont think so but I could be wrong.

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dots
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Re: removing battery with engine running?

Postby dots » Thu Sep 10, 2009 8:33 pm

give it a try, do no harm might not run just some older engines will run with out a battery :wink:
DOTS

lanigan
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Re: removing battery with engine running?

Postby lanigan » Thu Sep 10, 2009 8:39 pm

alternator should keep it alive, same as a flat battery after jump start really, battery is only used for starting, alternator does the rest

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podgie
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Re: removing battery with engine running?

Postby podgie » Thu Sep 10, 2009 10:08 pm

lanigan wrote:alternator should keep it alive, same as a flat battery after jump start really, battery is only used for starting, alternator does the rest


X2... :wink:
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^^^^
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Rob
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Re: removing battery with engine running?

Postby Rob » Thu Sep 10, 2009 11:58 pm

The alternator will keep it running, but caution was advised about connecting jump leads between cars before. Didn't someone fry a an ECU doing that? Disconnecting the battery load could cause a voltage spike.

If you do need to do it, be very careful that you don't drop the positive lead onto the metal frame, or you will definitely be looking at a charred mess.

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Tezzy
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Re: removing battery with engine running?

Postby Tezzy » Fri Sep 11, 2009 8:48 am

got my hands on a set of jump leads in the end, got it started with those 8)

The poles on the tezza battery were too big in any case for the supra clamps.

and managed not to fry anything. I think revving the car after its jumped is what causes the damage, it sends a surge back to the donor battery.

lanigan
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Re: removing battery with engine running?

Postby lanigan » Fri Sep 11, 2009 4:27 pm

Tezzy wrote: I think revving the car after its jumped is what causes the damage, it sends a surge back to the donor battery.


Spot on :wink: Let it start and idle is safer, i personally prefer a push start option if i dont have a battery or booster pack to do it

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alimac
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Re: removing battery with engine running?

Postby alimac » Sun Sep 13, 2009 10:31 am

Push start will only work if there is enough in the battery to power the injectors
98 RS200z 6MT


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