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Can't bolt down battery

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my battery was on its last legs which at this time of year is not ideal. I therefore got myself a new battery. I got a Bosch Silver 88 Ah (type 8A), which I know a lot of people here in Europe fit into their Carreras. This battery is slightly longer than the original 80 Ah Moll.

My problem is that the battery fits into the tray, but I can't bolt it down. There a four holes on the right side of the tray (left side if you look from the front) to accomodate different sizes of batteries. I need the outermost one. My problem is that only three of them actually have nuts attached to them to screw in the bolt, the outermost one doesn't have a nut in it, so I can't screw in the bolt.

My question:

- Is this intentional or is it just a manufacturing defect?

- Are there different types of trays around for different models?



2000 996 C2

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I checked the parts list and a UK C2 has the same battery tray we have in the US. That battery must be a few inches wider.

I have removed my tray so I know what you are talking about. 3 holes are threaded for the bolt for the clamp. The standard battery uses the middle threaded hole. The 4th hole is a drain hole and that is why you cannot screw in the bolt. If the clamp will work with the 4th hole then just use a nut under the tray. There is a drain hole on the other side of the tray so water will still get out.

I am thinking of buying the alarm siren/tilt sensor you have in the UK that mounts next to the battery. Perhaps you can sent me some pictures of how it is bolted down. Jeff


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Hi Don+Jeff,

thanks very much for your help. So it looks like this is the way it's supposed to be. Funny, for even with a nut welded on it would still be able to function as a drain hole. Excellent idea to just put in a longer bolt and a nut on the other side, I think that's what I'm going to do.

Sorry, can't help you with the tilt sensor straight away, because my car is German spec and hasn't got a tilt sensor. Next time I'm at the dealer's here I'll take a pic for you.



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I would see how the siren/sensor are mounted. A Boxster owner in the UK sent me pictures last year but it is hard to tell due to the angle. I know it is next to the battery on the passenger side on a RHD car. We cannot mount it like that on a LHD car as we have brake stuff in the way. But in looking at the list of parts in the retrofit kit it looks like the kit comes with a L and R bracket. Knowing Porsche, the kit will not have instructions.

I would also like to see how the loom runs from the siren/tilt sensor into the firewall. From looking at the wiring diagrams I know the wires are hooked up to the alarm control unit, which is under the driver's seat on a LHD car. So I must run wires from the battery area to under my seat. On a RHD car do you know under which seat the alarm control unit is mounted? This is what it looks like. Thanks.


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Ill look for you tomorrow. Horribly dark and cold here at the moment!

I had a problem with the tilt sensor which had to be replaced a few weeks back. The dealer took the drivers seat out as far as I know but I will confirm later in the week when I am passing.

Bear with me on this one-if the pics aren't helpful, I will do some more.


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Ravi sent me some pictures of the alarm siren/tilt sensor we do not have in the US. This one is taken from the left side - hard to see as the a/c stuff is in the way.


A UK Boxster owner sent me this one - no a/c.


My car from the left side. Would have to mount the alarm/tilt on the other side of the battery,


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