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efp
September 12, 2017, 10:23am Report to Moderator

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My dash heater fan switch fell apart, so replaced it with the only one I had to hand, which has a small LED in the tip, and a third terminal on the back, presumably to feed it.

See some earlier discussions here on OD indicator lights and as I'm new to an OD box I was thinking of wiring up this LED as an inconspicuous but visible reminder.

Before I blow up my wiring, or worse, am I right in thinking that I can just run a spur off the green/yellow wire from the column lever to this terminal to light up when engaged? Electrics aren't my strong point..

D type overdrive, neg earth, no idea of the specs of the LED.

Thanks
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RobPearce
September 12, 2017, 11:02am Report to Moderator

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Unfortunately you will need more detail of the LED to answer that. If it's just an LED then wiring that way will destroy it. If it's got the correct series resistor then it would depend on how the fan switch is wired. You need to know where the other end of the LED goes. Is the fan switch on the +ve or ground side?


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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JohnD
September 12, 2017, 11:14am Report to Moderator


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efp,

I'd be surprised if the switch doesn't carry some indication of the correct wiring for the terminals.  Unless they have worn off, in which case buy a new one?

The extra termional is an earth.     It 'supplies' that earth for the LED, so that it  lights up when yiou energise the item that it switches - the switch does not need a second power supply.

See this (although how you can make a video about just wiring a switch last five minutes .... )
https://www.youtube.com/watch?v=NpcqgZaqTjk

John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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efp
September 12, 2017, 11:50am Report to Moderator

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Ah. Thanks guys. Thought I was being too clever, obvious when explained.  

But a regular light on the dash would be ok? As it happens a PO has left me a surplus small hole there.  Can you confirm which OD wire I would tap in to?
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Pete Lewis
September 12, 2017, 12:09pm Report to Moderator

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i would take off either the  OD  relay trigger line from the  switch or ...pick up the feed to the actual OD solenoid from the relay
both will light a warning lamp,  but any led must be 12v or more ,  might  save the hassle.... use a bulb
Pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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efp
September 12, 2017, 12:39pm Report to Moderator

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Thanks gents.
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RobPearce
September 12, 2017, 4:12pm Report to Moderator

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I'd adopt Pete's second suggestion, parallelling the bulb with the solenoid. This is for two reasons:
1) that way the light tells you what's actually happening, not what the switch says
2) the solenoid is wired between relay and ground, meaning the bulb holder can be earthed

That said, Toby used to have such a bulb connected between the column switch and ground... which meant it lit up when overdrive was available but not engaged. Hey, don't blame me, I didn't do it!

Putting a bulb across the inhibitor switch (which could be done as a top-side-to-ground if the inhibitor is below the column switch) would mean it would light up if you forgot to switch out of OD before changing down to second (or neutral!), which could actually be useful.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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Hogie
September 12, 2017, 4:28pm Report to Moderator
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Hi EFP,
             you may well want to use a dimmer with the bulb/LED as at night it can be very bright.

I use an LED driven off the OD relay (A type OD) and using the side/dash lights to control the brightness through a small relay that brings in another resistor.

A normal LED (apprx 2V) will need a 1000 ohm series resistor. The dimmer resistor will be apprx 6800 ohm.

Roger

here is a simple circuit to sort it

Roger




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TR4A 1967 daily(ish) driver
TR41962  having surgery at present
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Dannyb
September 12, 2017, 5:33pm Report to Moderator

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I did an article in September 2015 issue of Club Torque.  Fitting a LED in the overdrive switch.


Danny Baker
Langdon Hills, Essex.
RBRR Finisher 2012  2014  2016
My first car in 1970 was a 1965 Spitfire4 with 8 port head stage 2 conversion
Now drive 1980 Spitfire 1500
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efp
September 12, 2017, 11:55pm Report to Moderator

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Again, thank you all guys for the great information.
Regrettably Danny, I don't have access to your article, wish I did.
j
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vitessesteve
September 13, 2017, 6:57am Report to Moderator

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Quoted from efp
Again, thank you all guys for the great information.
Regrettably Danny, I don't have access to your article, wish I did.
j


Try this link to the back issues of Club Torque: http://club.triumph.org.uk/cgi-bin/clubtorque/etorque.cgi?bimode=1 or click to it from the dropdown at the Magazine button in the header above.



PLEASE help us to maintain a friendly forum, use Report post button if you see anything you are unhappy with. Thanks.
Steve Weblin - AKA vitessesteve Forum Moderator and blogmaster

Cars - Valencia Blue 69 Vitesse Mk2 Saloon since 1991 and a TR7 Sprint.

blog http://vitessesteve.blogspot.com/ website http://www.vitessesteve.co.uk/

Newark UK based - studied class car restoration at Leeds City College


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efp
September 13, 2017, 4:39pm Report to Moderator

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Idly Googling on this subject: anyone know if the Logic Device with night dim box from Revington TR would work?   Seems a neat solution if a tad pricey (TR tax?)

http://www.revingtontr.com/engine-transmission/gearbox/logic-overdrive-device
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Hogie
September 13, 2017, 8:59pm Report to Moderator
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Hi EFP,
           if you are handy at soldering it is easy enough to make your own logic box with the dimmer I posted earlier for around £15.

Roger


TR4A 1967 daily(ish) driver
TR41962  having surgery at present
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efp
September 13, 2017, 9:59pm Report to Moderator

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Thanks Roger, but have to acknowledge my limitations, as you can see from my initial post. I can follow  the Haynes wiring diagram and crimp on the odd  Lucar, but beyond that ashamed to admit I'm an electrical numpty. Your suggestion is beyond my abilities, hence my interest in that turnkey Revington box.
I've emailed them and await their reply. Their site talks of the A and J type OD's as fitted to TR's, but not of the D, and the technicalities elude me.
The idea of the OD dropping out as the shift passes through neutral seems to make sense to me, as does the variable lamp dimming, but as I say my OD conversion is new to me and I have yet to get it on the road.
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RobPearce
September 14, 2017, 8:15am Report to Moderator

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Quoted from efp
The idea of the OD dropping out as the shift passes through neutral seems to make sense to me, as does the variable lamp dimming, but as I say my OD conversion is new to me and I have yet to get it on the road.


The OD will drop out passing through neutral (between third and fourth) on a TR because of the way the inhibitor switch is fitted. It does not do so on the small gearbox (Spitfires & GT6s) because the inhibitor works differently. The latter makes for much smoother 3OD to 4OD changes. Changing from 3OD to 4 is largely pointless on a GT6 (and a very minor change on a Spitfire) because of the ratios.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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