The oil and brake lights are only in series when the oil pressure switch
closes. When oil pressure is low both lights will glow dimly. Bentleys has
a chart of light activity. But, if the pdwa closes the brake light alone
will light.
I would agree that the system is stupidly designed but that if you know the
scheme you know what to watch for. A redesign ought to have a bright light
for low oil pressure. Maybe a flasher to make it more noticeable.
Jim Altman jaltman@altlaw.com Illigitimi non Carborundum
http://www.altlaw.com/metro/jaltman.html 69-TR6#CC28754L W4UCK
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Bandre Frank
> Contractor AMC/SCP
> Sent: Wednesday, January 06, 1999 9:12 AM
> To: 'triumphs@autox.team.net'
> Subject: Starter relay for 76 TR6
>
>
>
> To all
>
> I have been working on trying to figure the wiring diagram
> for my 76 TR6 and
> have several ideas to share. Also, the major input for the
> starter relay use
> came from Tom O'Malley who has done this same effort for his
> 76 Spitfire.
>
> 1) The starter relay (or 'bulb check' relay as Tom calls it)
> provides a
> ground path for the brake line failure/handbrake warning
> light and the EGR
> service warning light during startup. This allows the bulbs
> to be checked
> during start. As far as I can tell, the C4 contact should go
> to a point
> between the brake line failure light (#76) and the brake line
> failure switch
> (#77). The C1 contact should go to a point between the EGR
> service light
> (#43) and the service counter (#41).
>
> 2) Change to the wiring diagram should be made as follows: the oil
> pressure warning light (#78) should be in parallel with the brake line
> failure light (#76), not in series with the brake light and brake line
> failure switch or PDWA (#77). As drawn, the only way the oil pressure
> warning light would come on would be to have the PDWA be
> closed as well.
>
> 3) Another wiring diagram change is to have the brake line
> failure switch
> and the handbrake switch in parallel, with both paths being
> grounded to the
> chassis ground directly.
>
> I am still working on the correct placement of the ballast
> resistor wire and
> the correct path for the by-pass during startup.
>
>
> Frank
>
> '76 TR6 CF57005U
>
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