T 140V electrics - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 18 (permalink) Old 06-20-2018, 06:14 PM Thread Starter
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Smile T 140V electrics

I'm rewiring my T 140 V and just need to be sure which wiring diagram to use. There are two in my Haynes Manual, for one switch or for two switch models.
How can I tell which mine is- one or two switch? ( I don't even know which switches this refers to!)
Any advice would be much appreciated
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post #2 of 18 (permalink) Old 06-20-2018, 06:49 PM
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Hi Ploughboy,
Please post the two letters at the start of your frame number, the year and month of manufacture can then be determined.
This will greatly assist in locating the correct wiring diagram for your bike.
Not many on this forum trust the Haynes manual, it is too generic, Triumph workshop manuals are available for download, these were reviewed and revised year on year, thefore before you can be directed to the information suited to your bike, we first have to establish the build date.
Regards
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post #3 of 18 (permalink) Old 06-20-2018, 09:28 PM
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ploughboy


From another your other post you stated you have a US model T140V as do I. I therefore assume you VIN is somewhere between HX 00100 and JX 10747. By the fact you have a '78 T140V I would guess your VIN is probably no greater than XX03610 (mine is NX01010) as bikes for the US market built after 01/01/1978 were T140E models.


I use a wiring diagram from the US owners manual for my bike. This can be seen at www.classicbike.biz in the owners manual section. The only difference I have found between the US vs. UK model wiring is the connection at the ignition switch.


K




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I recently ran across your U Tube Video from a couple of years ago most enjoyable Thank You


K

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Last edited by KADUTZ; 06-21-2018 at 04:05 AM. Reason: Typing error
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post #4 of 18 (permalink) Old 06-21-2018, 02:24 AM Thread Starter
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Thanks Peg and Kadutz
Mine is XX02646. I bought it as a T140V- did you mean 1/1/79, or is it a 140E?
Yes, I think the Haynes might be best for keeping the garage door open on a hot day!
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post #5 of 18 (permalink) Old 06-21-2018, 03:48 AM
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Production of 1978 T140's started in July of 1977. Your bike with an XX VIN would have been built in December of 1977 as a 1978 model T140V.

Production of the T140E started in January 1978 as a 1978 model. This was after the U.S. EPA found the MKII carbureted bikes to be in compliance with US regulations in late December of 1977.

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Last edited by KADUTZ; 06-21-2018 at 03:59 AM.
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post #6 of 18 (permalink) Old 06-21-2018, 04:54 AM
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Hi,

Welcome to the Forum.

Quote:
Originally Posted by ploughboy View Post
Mine is XX02646. I bought it as a T140V- did you mean 1/1/79, or is it a 140E?
'78 and '79 T140's can be confusing, not helped by we (and Triumph) refer to the 'Model Year' (aka 'season') not the calendar year.

The "XX" indicates a 1978 Model Year (the right-most "X") bike built in December (the left-most "X"). However, because Meriden usually changed from building one Model Year's bikes to the next Model Year's bikes during the summer, your bike was actually built in calendar December 1977.

Complicating this particularly in the 1978 Model Year was the US Federal government introduced new FMVSS regs. on 1st January 1978 applying to all vehicles built after that date. These regs. particularly stiffened the emissions requirements and changed the lighting requirements (always-on); as "Kadutz posted, to meet them, Triumph started producing a version of the T140E just for the US. It's this version of the T140E that causes most consternation and likely isn't even mentioned in the Haynes manual.

Returning to your bike, as it was built before 1st January 1978 is probably why it could be imported and sold in the US during calendar 1978. If it's 'correct', it has a 'splayed port' cylinder head - the carbs. stick out at an angle from the centreline of the bike - you press a tickler button on each 'til fuel squirts out before trying to start the engine from cold; the main engine breather is a large-diameter pipe clipped around the edge of the rear fender, one end attached to the primary chaincase under the left-hand carb., the other end open to atmosphere behind the rear license plate?

Quote:
Originally Posted by ploughboy View Post
rewiring my T 140 V
which wiring diagram
two in my Haynes Manual, for one switch or for two switch models.
( I don't even know which switches this refers to!)
I'll say "two switch" - 2-position (off/on) key-operated ignition switch in the left-hand headlamp mounting and 3-position (off/tail-'n'-pilot/head, originally at least) toggle-operated lighting switch in the top of the headlamp shell.

Digressing, the "one switch" likely refers to the '79-on second version of the T140E, that has a 4-position key-operated combined ignition and lighting switch mounted with the idiot lamps in a console between the speedo. 'n' tacho.

If your bike's electrics are "two switch", it also has:-

. A single Brown/Blue (insulation mainly Brown with one or two thin Blue stripes) wire attached specifically to the battery negative terminal; one or more specifically Red-insulated wire(s) attached to battery positive?

. Red wires in many places on the bike attached either to or near electrical components?

. The alternator cable - emerges from the primary chaincase under the left-hand carb. - attaches to the rectifier with a White/Green wire and a Green/Yellow wire?

. Inside the headlamp, the Lighting toggle switch has a White and a Blue wire attached to adjacent spade terminals at one end of the switch, and a Brown/White and Brown/Green wires attached to adjacent spade terminals towards the other end?

If you can check the above, click here for a free download of the Triumph '73-'78 750 twin workshop manual, the correct wiring diagram is on manual page H22 (.pdf page 191).

That diagram shows the Lighting toggle switch wiring connections exactly as I've described them above, attached to a switch numbered "34419". Otoh, as Kadutz mentioned, '78 T140E's have a different switch and wiring - looks similar but has a different number (31788 or 35710) and either the White or Brown/White wires won't be present. This wasn't fitted as standard to T140V's but it's an easy conversion if the first owner wanted always-on lights.

If you find that or any other differences on your bike, come back with details and we'll get you through the minefield.

Quote:
Originally Posted by ploughboy View Post
rewiring my T 140 V
Standard wiring was very-much 'built to a (very low) price'; there are various inexpensive 'sensible mods.' worth making, post if you want details.

Quote:
Originally Posted by ploughboy View Post
think the Haynes might be best for keeping the garage door open on a hot day!


Hth.

Regards,

Stuart

Last edited by StuartMac; 06-21-2018 at 05:00 AM. Reason: Damn! Beaten by "Kadutz" again. :)
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post #7 of 18 (permalink) Old 06-21-2018, 05:57 AM
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I think the easiest way to check your model wiring is to check if yours is positive or negative ground.
The colour of the wires to the frame, red positive. black negative ground and the battery connections.
Also. the T140V models have single phase alternator and rectifier, postive ground, which you probably have.
E and D models are 3-phase negative ground, E (environmental) replaced the T140V models.
The 'switches' in Haynes refer to the handlebar switches, lighting. horn, indicators, etc, you have two switches.
Therefore you should use the wiring diagram on P.210 in Haynes, or the 73-78 diagram refered to here:
http://www.classicbike.biz/Triumph/R...hop-Manual.pdf
Although the Haynes book has errors in various sections, so does the official Triumpn workshop manuals.
i.e. the Triumph wiring diagram shows the horn switch normally closed...horn normally on all the time?
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post #8 of 18 (permalink) Old 06-21-2018, 09:24 AM Thread Starter
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Thanks Kadutz, StuartMac and Caulky. It's definitely a two switch model, the wiring is as you described StuartMac, so I know which diagram to go with now.
Great help from the forum, I'll probably surface with a few questions once I identify all the wires on the harness and get to installing it. It's a big help knowing all your knowledge is on tap, thanks.
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post #9 of 18 (permalink) Old 06-22-2018, 12:34 PM
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I think the 78 E's were positive earth? The 79's were negative
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post #10 of 18 (permalink) Old 06-22-2018, 12:55 PM
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1978 T140V/T140E & TR7 models were all positive ground. Starting with the 1979 model production they were changed to negative ground.

T140E & T140V for the 1978 model year were basically the same bike as far as the electrics.

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Last edited by KADUTZ; 06-22-2018 at 12:59 PM.
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