Electrical power loss at 12v jumper terminals
Thread Starter
Member
Joined: Sep 2007
Posts: 210
Likes: 16
From: Sydney Australia
W205 C250BT & R320cdi-L V251 (sold c220 cdi Elegance)
Electrical power loss at 12v jumper terminals
Hi, hoping someone like an auto electrician can help me troubleshoot this electrical problem.
My 1180CCA rated battery reads half that when tested at the engine bay jumper terminals.
When tested on the battery terminals it reads 1100CCA.
As a result (and whilst its winter in Australia) its finding it hard to crank over, especially in the mornings.
Any tips would be appreciated.
My 1180CCA rated battery reads half that when tested at the engine bay jumper terminals.
When tested on the battery terminals it reads 1100CCA.
As a result (and whilst its winter in Australia) its finding it hard to crank over, especially in the mornings.
Any tips would be appreciated.
Out Of Control!!
Joined: Sep 2018
Posts: 14,668
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From: unbegrenzt
2017 GLE350 4MATIC
How old is the battery? It sounds like it might be time to replace it.
Measuring anything at the jumper terminals doesn't indicate battery condition. Measuring directly on the battery is how to measure the battery. If the engine is slow cranking I would replace the battery, and the auxiliary battery while you are at it.
Measuring anything at the jumper terminals doesn't indicate battery condition. Measuring directly on the battery is how to measure the battery. If the engine is slow cranking I would replace the battery, and the auxiliary battery while you are at it.
Thread Starter
Member
Joined: Sep 2007
Posts: 210
Likes: 16
From: Sydney Australia
W205 C250BT & R320cdi-L V251 (sold c220 cdi Elegance)
How old is the battery? It sounds like it might be time to replace it.
Measuring anything at the jumper terminals doesn't indicate battery condition. Measuring directly on the battery is how to measure the battery. If the engine is slow cranking I would replace the battery, and the auxiliary battery while you are at it.
Measuring anything at the jumper terminals doesn't indicate battery condition. Measuring directly on the battery is how to measure the battery. If the engine is slow cranking I would replace the battery, and the auxiliary battery while you are at it.
They are the ones that said it tests fine out of the car!
