Wiring up replacement Alternator for a Triumph TR250 1968

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bob195558
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Wiring up replacement Alternator for a Triumph TR250 1968

Post by bob195558 » Wed Aug 07, 2019 10:05 pm

Riding in TR250 Car_c.jpg
Triumph TR250 1968
Hi,
I am having trouble with getting the charging system to work.
I have a 1968 Triumph TR250 which I got it back in 1973 that needed a lot of repairs.
The alternator (charging system) was not working
and I had an old Chrysler generator which I installed (this was working well)
and now it has failed.

Purchased and installed a new alternator for TR250 which is also not working
and which is not a match to the original wiring even though is sold to be a match.

I have only connected the large Brown / White wire to the center alternator terminal.
There are two other smaller wires which are Brown / Yellow and Brown / Green
with there smaller connector terminals, which I have not connected,
because these connector terminals are to small to make the connections to the alternator.

The car wiring is not matching up with this new TR250 alternator.
TR250 Car alternator wiring_a.jpg

Lucas Alternator 1968 Triumph TR250_b2.jpg
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Alternator car wiring for 1968 Triumph TR250

1) Large Brown / White (+) wire to alternator (center large terminal)

2) Small Brown / Yellow wire to ?

3)Small Brown / Green wire to ?
------------------------------------------------------------------------------------------------------------------


Some TR4 Generator wiring info I found on line, which may be a help (click on picture to view better).
Generator to Alternator Conversion Triumph TR4_a2.jpg
Some TR4 Generator wiring info I found on line
Generator to Alternator Conversion Triumph TR4_f2.jpg
Some TR4 Generator wiring info I found on line
------------------------------------------------------------------------------------------------------------------


Any help would be appreciated, Thank You.
Last edited by bob195558 on Wed Aug 21, 2019 1:15 pm, edited 3 times in total.
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bob195558
Posts: 2099
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Re: Wiring up replacement Alternator for a Triumph TR250 1968

Post by bob195558 » Thu Aug 08, 2019 10:39 am

Found some more wiring info that looks more like what this new TR250 alternator may be.
Lucas Alternator Wiring_c.jpg
Last edited by bob195558 on Fri Aug 09, 2019 12:03 pm, edited 1 time in total.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.

3D Printing upgrades with (CR10 3D Printer): (http://openrcforums.com/forum/viewforum.php?f=85).

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bob195558
Posts: 2099
Joined: Sun Dec 16, 2012 7:24 pm
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Location: New England, Vermont
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Re: Wiring up replacement Alternator for a Triumph TR250 1968

Post by bob195558 » Thu Aug 08, 2019 11:32 am

This maybe what the wiring should be.

Large Brown/White wire from Battery (+) to alternator center large terminal.

Smaller Brown/Yellow wire from ignition light to alternator top small terminal.

Small Brown/Green wire to ? (maybe to a dash light and maybe connected with the top small terminal).
Last edited by bob195558 on Wed Aug 21, 2019 1:03 pm, edited 1 time in total.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.

3D Printing upgrades with (CR10 3D Printer): (http://openrcforums.com/forum/viewforum.php?f=85).

User avatar
bob195558
Posts: 2099
Joined: Sun Dec 16, 2012 7:24 pm
Country: United States
Location: New England, Vermont
Contact:

Re: Wiring up replacement Alternator for a Triumph TR250 1968

Post by bob195558 » Thu Aug 08, 2019 4:32 pm

Update: With the Smaller Brown/Yellow wire from ignition light to the
alternator top small terminal, the new alternator is now Charging properly. :D

Note: I also found some more info about the alternator's top small terminal.
This top smaller terminal must have at least two volts from the battery when
the Ignition switch is turned ON.
When the voltage to this top small terminal is less then two volts,
it will prevent the alternator from charging.


The small Brown/Green wire that may go to a dash light somewhere, I checked with the multimeter
and it seems to not be connected to anything.
I did try, by connecting it with the smaller Brown/Yellow wire from ignition light
and nothing happened. I left it disconnected for now.

Also with the Ignition switch when turned Off, the dash lights are ON all the time.
Need to investigate this more, maybe the dash light ON/Off dimmer switch is the problem.
I will disconnect the battery for now, so it will not discharge it.
Last edited by bob195558 on Fri Aug 09, 2019 12:54 pm, edited 1 time in total.
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.

3D Printing upgrades with (CR10 3D Printer): (http://openrcforums.com/forum/viewforum.php?f=85).

User avatar
bob195558
Posts: 2099
Joined: Sun Dec 16, 2012 7:24 pm
Country: United States
Location: New England, Vermont
Contact:

Re: Wiring up replacement Alternator for a Triumph TR250 1968

Post by bob195558 » Fri Aug 09, 2019 11:59 am

Update:
I turned the dash light switch all the way down and push on it too and which had no affect.
After disconnecting the battery and reconnecting it, the dash lights seem to be working better now
as the dash lights are OFF with the battery connected now.
Maybe the dash light switch has debris and dampness in it.
It is hard to get the dash out to have access to the switches and gages,
but looks like this maybe be a needed thing to do.
TR250 Dash_a.jpg


This youtube video was helpful with wiring the new alternator: (https://www.youtube.com/watch?v=KQJA5ELWRGs).
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.

3D Printing upgrades with (CR10 3D Printer): (http://openrcforums.com/forum/viewforum.php?f=85).


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