[6pack] Brake and Oil Warning Lights

[Dave]

Many thanks to all who responded! I will be checking the PDWA piston centering and re-try the circuit. It's 'funny' how, sometimes, wiring diagrams show items to be side-by-side in the circuit but may actually be quite remote from each other.

Thanks again, all, for the assist...

Cheers!

Dave
'74 Six w/A-OD and TBI
 
---- "Navarrette wrote: 
>  	Dave:
> 
> 	The twisted logic works thus:
> 
> 	The brake warning light must (by federal law) illuminate when the key is in the run position, but the engine is not running. It must also extinguish when the engine starts UNLESS there has been a brake failure.
> 
> 	The twisted wiring you see there permitted the factory to meet this requirement without adding another oil pressure switch or some other device to ground the brake warning light. It also permits the oil pressure light to function more or less normally using the same oil pressure switch as the brake light.
> 	I defy you to meet the above requirement without adding an additional part to car, while preserving the functionality of the oil pressure warning light. It is not obvious to me as to how it can be done. 
> 	Given that you are required to have a brake warning light (which requires a light and a brake warning switch of some sort) and you wish to have an oil pressure idiot light, it is actually very clever. It saved you $1.39 that it would have cost to add another switched grounding point for the brake warning circuit.
> 
> 	Vance
> 	
>     Vance Navarrette
>     Cogito Ergo Zoom
>     I think, therefore I go fast
> 
> -----Original Message-----
> From: 6pack-bounces at autox.team.net [mailto:6pack-bounces at autox.team.net] On Behalf Of Dave
> Sent: Tuesday, May 05, 2009 1:10 PM
> To: 6pack at autox.team.net
> Subject: [6pack] Brake and Oil Warning Lights
> 
> Hey List;
> 
> Can someone take a look at the diagram in the lower right corner of page 102 of the Dan Master's TR6 "Electical Maintenance" book and help me out? I hate to use the word 'logic' when discussing Lucas handiwork but, what is the logic of having the brake failure switch activating both the oil warning lamp and the brake failure lamp? 
> 
> <snip>
> 
> Thanks for any help...
> 
> Dave