Grounding point under bonnet?

[madasafrog666]

Hi all, I have bought a trickle charger for my boxster and according to the instructions the negative connection should be attached to the block or similar.
Does anyone know if there is a grounding point under the bonnet.
Or is it ok just to connect to the negative terminal on the battery?

Thanks

[elisered]

On my Spyder one on wiper mounting (drivers side of vehicle) clearly marked and another bolt hole on near side that’s less obvious. I put a stud in the latter and use this as it avoids stretching the conditioner cables. A good thread somewhere on here about why it’s advisable not to connect direct to battery terminals.

[bo duke]

It’s for a 981 but may help:
- http://www.911uk.com/viewtopic.php?t=125032