2004 Touareg TDI v10 Battery Relay - Club Touareg Forums
 
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post #1 of 10 Old 10-26-2017 Thread Starter
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2004 Touareg TDI v10 Battery Relay

Purchased this low mile 04 non running. I had to bypass the battery relay? in the truck to get juice to anything. Basically just moved over the wire so it red full power across the relay for temporary. How important or what exactly is this for. Was all corroded must have had water in battery tray area at one time. Thanks again. Need to get this beast rolling.
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post #2 of 10 Old 10-26-2017
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I also have to have mine bypassed. The alternator then is charging two batteries in parallel. I had replaced both batteries with new when I purchased it and it would not charge the rear battery which would eventually start the diet out after a number of starts. Whatever was supposed to turn that relay on was not doing its job. Been running with the relay bypassed for two years and no issues.

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post #3 of 10 Old 10-27-2017 Thread Starter
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So where is the second battery? Didnt realize there was 2?

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post #4 of 10 Old 10-27-2017
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Quote:
Originally Posted by Dzldoctor View Post
Purchased this low mile 04 non running. I had to bypass the battery relay? in the truck to get juice to anything. Basically just moved over the wire so it red full power across the relay for temporary. How important or what exactly is this for. Was all corroded must have had water in battery tray area at one time. Thanks again. Need to get this beast rolling.
Where is this relay, is it under the seat? just in case i need to bi pass mine in the future.
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post #5 of 10 Old 10-27-2017 Thread Starter
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Connected to the battery in the trunk.

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post #6 of 10 Old 12-06-2018 Thread Starter
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Originally Posted by imquattro View Post
I also have to have mine bypassed. The alternator then is charging two batteries in parallel. I had replaced both batteries with new when I purchased it and it would not charge the rear battery which would eventually start the diet out after a number of starts. Whatever was supposed to turn that relay on was not doing its job. Been running with the relay bypassed for two years and no issues.
Not sure of VW theory but why do they want to put a relay and only charge at certain times? I replaced both batteries this spring and now that got cold been fighting an issue again. When I installed new batteries I put that relay back into the circuit. Now that it got cold been having all kind of issues. I just bypassed again and going to reevaluate. Is there a reason in the VW wisdom to not leave both batteries in parallel? I am confused. my wife got stranded an I get yelled at. LOL

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post #7 of 10 Old 12-07-2018
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The starting is done by the rear battery with the under seat battery helping out on consumer stuff.

If the rear battery can't start the car the under seat battery can take over by dumping it's own jobs during the start process.

If the two batteries are in parallel then I guess the either or start capability is lost?

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post #8 of 10 Old 12-07-2018
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post #9 of 10 Old 12-07-2018
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There is/was an issue on the 2004 V10 concerning order of connection and disconnection of the two batteries. The Bentley manual warned about damage to “electrical equipment” if the rear battery was disconnected before the front. This does not not seem to be an issue on my 2006 although disconnecting the rear first will throw a bunch of codes.

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post #10 of 10 Old 01-01-2019
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Does anyone have more information on charging the batteries in parallel? I have been plagued with battery and starting issues in the winter after replacing both batteries multiple times.
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