Possibly.
On the negative battery terminal you have the thick earthstrap which earths the body and engine, but you have, (or should I say, I have) several other earth leads.
I've no idea what they do but if they earth the central locking and radio via a control unit, it is possible that a poor...
2015 T6 DSG..
Where abouts is the main earthstrap?
Van broke down last week and everything pointed to the alternator which i replaced.
Today I’ve had a trailer plugged into my van and I’d left the lights on for 30mins. It completely killed the van.
Took ages to jump off but managed to get it...
Main chassis earthstrap is a known problem.
Try using a jumper cable from the engine block to battery neg post and see if it starts.
If so look at the earthstrap.
Hi mate
I have had the same problem it’s been to main dealer they said earthstrap and carried out a repair which did nothing, I then took it to an independent who couldn’t find a fault so I just live with it now which is annoying but it always eventually starts (90% of the time it’s perfect)...
Engine ground strap?
https://www.t6forum.com/search/1248371/?q=earth+strap&o=relevance
ECU power supplies - fuses?
https://www.t6forum.com/threads/t6-non-start.37800/post-515231
How does the engine start - immediate start-up always or some cranking before firing up?
...was trying to suggest connecting a jump lead from the battery negative to a ground point on the engine block to see if the issue was with the earthstrap on the engine.
While it's not usually a good idea to connect straight to the battery past the shunt in this case it's fine for a quick test.
When this happened on my Renault tragic the AA guy swapped the engine earthstrap and all was well. Apart from the fact that it was still a Renault!
To be fair it was a good work horse!
Not uncommon for issues with main chassis earth, check the earthstrap in front/to the left of the battery (stood in front of van facing the engine bay)
Can give weird issues that come and go and would be similar to loose battery terminal
I would be checking all the battery and alternator connections- positive and earth. There is a known issue with a corroding earthstrap connection.
After that I would start to suspect the alternator itself.
Pete
If you can hear the relays clicking it might be starter motor related, like corroded connection or bad earthstrap to the chassis at the cam belt cover end.
...Help Identifying Fuses Please
Does that loose earth wire go to the 100 relay? If yes, it connects to the same chassis ground point as the battery earthstrap.
You should be safe to turn the battery around and connect the earthstrap. and then confirm each red wire before you connect them up.
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