[T3] DOT 5 and brake light switches

[Jim Adney]

On 19 Nov 2015 at 9:18, Sean Bartnik wrote:

> Hmm that's interesting, maybe it is indeed coming from the flasher
> relay. Doesn't sound like it though; it's not as loud as the normal
> click of the flasher relay when, for example, the turn signals are
> engaged. Sounds farther away and muffled, like I'm hearing it through
> the bulkhead. 

On cars before '71, the TS relay contains 2 separate internal relays. 
On my '68, the system transient caused only one of them to click, and 
it wasn't the one that made the TS lamps flash. When you're actually 
using the turn signals, both relays click, so, yes, the brake light 
click was quieter.

The second relay in there is part of the system VW used to sense 
whether all the bulbs were working. If you lost a bulb, the second 
relay would not click and that made the relay clicks happen faster. 
It's a complicated system and it took me a long time to figure out 
how it worked. Not sure I still remember the details.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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