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Re: [T3] New VR Warning

<x-flowed>Is the VR in a different place in the Type 3 than the Type 34?

I've got one of the new-type VRs, and I don't think there's any way it can touch anything.

Maybe I should look again. . .


On 18 Jul 2005 at 10:41, Matthew Jones wrote:

I just spotted a potentially serious detail on the new
Bosch voltage regulator:

The whole outer metal shell is D+. This means that when
the engine is running, it is at 12 to 14v.

This sounds like a serious flaw. Was there any warning with the VR, or was this
something that you had to discover for yourself?

This picture shows the old & new side by side:

This picture shows a side view:

I can't quite tell from the photos, but is it clear that the D+ terminal is NOT
insulated from the upper case? I can see that the other 2 terminals DO appear
to be insulated. Is there a ground connection point that is separate from the
upper case?

I think an appropriate safety device may be an old
margarine tub over the whole thing.

I replaced the vinyl "insulation" next to my VR with duct
tape covered in PVC insulating tape. PVC tape on its own
isn't sticky enough, and gets saggy when hot.

There's a good reason for this design, I think. You can see
3 electronic components pressed into the shell. By doing this
they get a nice big heat sink area.

The heat sink is a good reason, but I don't understand why the new VR had to be
larger than the old one. It should have taken up quite a bit less room.

Unless there's something wrong with the one you got, I'd say that this is a
serious design flaw. Most people would not have noticed this, and this would be
likely to lead to damage to the generator or VR. That would have PO'd a LOT of

Can anyone else out there confirm Matt's observations?

Jim Adney
Madison, WI 53711-3054

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org


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