The Coolant Temp light on the 1.9 appears to have both ends going into a
magic box according to Bentleys. It may be that one side of the lamp is
tied high, or the other low, but without getting into the dash, it's
unclear: they may both be active wires.

Anyone have the scoop on this?

--
Mike "Rocket J Squirrel" Elliott
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
Bend, OR
KG6RCR

On 12/16/2009 5:43 PM Mike S wrote:

> At 07:55 PM 12/16/2009, Richard Koerner wrote...
>> What we need is a simple fix. A small "box" of electronics, wired in
>> so as to detect any of the red LED's coming on (oil pressure,
>> alternator, coolant temperature), with a LOUD piezo speaker blasting
>> you to "get OFF the road and shut down IMMEDIATELY!!!. Doesn't have
>> to speak words....just be obnoxious.
>
> Depending on the individual circuit, a warning lamp might be triggered
> by a wire going high (other side of the lamp is always grounded), or by
> a switch to ground (other side of the lamp is always +12V). Both can be
> combined in a "wired-or" by using a diode for one type, a transistor
> for the other. Then just send the combined signal to a piezo buzzer,
> like a Sonalert. <$10 in parts.
>
> (BTW, this is hardly EE level stuff)
>