Results 1 to 11 of 11

Thread: power wirer for the heater switch

Discussions of Triumph motor cars

  1. #1
    Darth Vader
    Join Date
    Nov 2004
    Location
    washington state
    Posts
    2,935
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    10
    Thanked in
    10 Posts

    power wirer for the heater switch

    I looked around on line and found some information about a green power wirer for the heater switch. Near as I can figure, the power of the heater switch is a green wirer that goes from the fuel gauge to the switch. I assume the wire would go over the top of big gauges and onto the fuel gauge, but I guess the wire could go along the bottom of the dash. Does this sound correct?

  2. #2
    Yoda CJD's Avatar
    Join Date
    Feb 2011
    Location
    Southlake, TX, USA
    Posts
    5,007
    Thanks Thanks Given 
    4
    Thanks Thanks Received 
    18
    Thanked in
    18 Posts

    Re: power wirer for the heater switch

    Sounds good to me. I routed high so it would never start to "hang down"!
    John

    1955 TR2

  3. #3
    Obi Wan
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    2,000
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    17
    Thanked in
    15 Posts

    Re: power wirer for the heater switch

    The Drawing I have shows the heater supply coming from "A2" on the fuse box which is live all the time.

    To prevent me from accidentally leaving the heater on and draining the battery I added a relay that is powered by the ignition switch supply. So the heater can only be on when the ignition is on.

    David
    TR3A TS75524L

  4. #4
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    18,714
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    46
    Thanked in
    44 Posts

    Re: power wirer for the heater switch

    Quote Originally Posted by DavidApp View Post
    The Drawing I have shows the heater supply coming from "A2" on the fuse box which is live all the time.

    To prevent me from accidentally leaving the heater on and draining the battery I added a relay that is powered by the ignition switch supply. So the heater can only be on when the ignition is on.

    David
    FWIW, that connection does not match any of the factory information I have. The TR2 workshop manual makes it clear that the heater is to be controlled by the ignition switch.

    It is my opinion that the author of that diagram simply got it wrong.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  5. #5
    Obi Wan
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    2,000
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    17
    Thanked in
    15 Posts

    Re: power wirer for the heater switch

    Hello Randall

    I was looking at the drawing by AUTO-WIRE. Thought it was accurate.

    David
    TR3A TS75524L

  6. #6
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    18,714
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    46
    Thanked in
    44 Posts

    Re: power wirer for the heater switch

    Yes, I know. That's the only one that shows the connection to A2. The factory diagrams don't show it at all, but the text in the workshop manual says to connect it to the hot side of the wiper switch, which is controlled by the ignition switch on earlier cars. On later cars, I believe it was connected to the hot terminal on the fuel gauge, which again is controlled by the ignition switch and protected by the fuse.

    There are a few other minor details on that diagram that aren't right, but it's pretty close. The fellow that originally produced it did not own a TR3A, and apparently was just condensing information from the manuals. The preliminary version he sent me for review said only "Where does this connect" He sold Advance AutoWire shortly after that, IIRC he had some health issues and wanted to spend more time with his grandkids.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  7. #7
    Yoda martx-5's Avatar
    Join Date
    Jul 2002
    Location
    Kings Park, NY
    Posts
    6,516
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    3
    Thanked in
    3 Posts

    Re: power wirer for the heater switch

    Quote Originally Posted by TR3driver View Post
    FWIW, that connection does not match any of the factory information I have. The TR2 workshop manual makes it clear that the heater is to be controlled by the ignition switch.

    It is my opinion that the author of that diagram simply got it wrong.
    Yeah, that "A2" connection appears in the Advance Auto Wire schematic.
    Art
    '58 TR3A TS236xxL
    '92 Mazda Miata -- Supercharged
    '07 Mazda RX-8
    '11 Mazda CX-7

  8. #8
    Darth Vader
    Join Date
    Nov 2004
    Location
    washington state
    Posts
    2,935
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    10
    Thanked in
    10 Posts

    Re: power wirer for the heater switch

    This car is TS 27036 so it is kind of early. I like the idea of the wiper switch because that switch is closer to the heater switch, but the fuel gauge already feeds that switch, so it really would not matter much. Those little tiny nuts on the fuel gauge are becoming more of challenge for me and they are probably hard to find, and the wiper switch has the lug for the wire, so that could be a plus. I need to dive in and see.

  9. #9
    Great Pumpkin TR3driver's Avatar
    Join Date
    Aug 2003
    Location
    Sunny So California
    Posts
    18,714
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    46
    Thanked in
    44 Posts

    Re: power wirer for the heater switch

    TS27036 should have the later wiper motor, which means the wiper switch is grounded rather than being fed from the green circuit. Piggott gives the change point as TS12567.

    You could use A4 on the fuse block, if you want to. That would be equivalent.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  10. #10
    Obi Wan
    Join Date
    Feb 2016
    Location
    Macon Georgia
    Posts
    2,000
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    17
    Thanked in
    15 Posts

    Re: power wirer for the heater switch

    That would be much easier to get to with your connection.

    On my relay mod I also used it to feed a 12 Volt power outlet for GPS and a pair of USB outlets for phone charging.

    David
    TR3A TS75524L

  11. #11
    Jedi Warrior 6TTR3A's Avatar
    Join Date
    Mar 2008
    Location
    San Diego, CA
    Posts
    418
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Re: power wirer for the heater switch

    David & Randall got it right...Use the A4 connector at your fuse block.
    That's where the green wire to the fuel gauge comes from & it's much
    easier to get to. It is switched and fused which is what you want.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •