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Greg, Technician
Category: Car
Satisfied Customers: 7639
Experience:  Automotive diagnostic tech
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Have a 2007 transit with twin batterys aux battery keeps

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hi have a 2007 transit with twin batterys aux battery keeps failing had new battery at christmas

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

Check what the voltage is at the battery when the engine is running ,


Customer: replied 6 months ago.
hi greg 13.5 volts

Well it charging do you have anything extra hooked up to this battery.


Customer: replied 6 months ago.
Nothing extra on van this battery is only 3 months old is there a relay or switch which may havefailed

Factory duel battery system or aftermarket .


Customer: replied 6 months ago.
Standard British spec

Check and see if you have on that side a parasitic drain .

Got to be something bringing it down if this battery is the only one affected .


Customer: replied 6 months ago.
can i check this using a multi meter if yes how

Use this link for the test .


Explain quite good on how to check for battery drain .


Customer: replied 6 months ago.
got battery on charge overnight will try to track fault tomorow thanks for your help kevin

Okay sounds good ,get back to me if needed.

For further assistance with this issue please get back to me with the reply box below .
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Rgds Greg

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