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  • Wiring help

    Last season I turned on the headlamps, and smelled burning wires. My head lights still worked, but I lost all my gauges. I had installed a new headlamp kit with relays a couple of years ago. I pulled the dash, and immediately saw the issue. The Red wire that goes to the headlight switch was fried. I traced it to the fuse box, and jumpered a new wire to the headlamp switch. The fuse is the one that has 2 red wires.I cleaned my headlamp switch as well. Here are the details I know. The Red wire shows no power at the fuse, when I activate the head lamp switch, the red wire shows voltage at the switch. Oddly enough when I throw power from the switch, the remnant of the burnt red wire shows voltage! Go figure its not hooked up to either end. The brake lamp indicator bulb, and the glove box bulb work. There was some melting of adjacent wires, but I see no breaks. I have Dan Masters electrical handbook, but I'm not experienced in wiring. Anybody know where I should go from here?
    Sorry 74 model non OD
    Last edited by TR Robbins; 04-07-2019, 06:46 PM.

  • #2
    The year of the car would help since the6 are wired a bit different through the years.
    I72 Pimento w/overdrive

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    • #3
      Sorry 74 Model Non OD

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      • #4
        I would start with how/where you installed the headlight kit, it’s related to the red wire.
        I72 Pimento w/overdrive

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        • TR Robbins
          TR Robbins commented
          Editing a comment
          The headlights are the only thing that works properly. Do you still think that could be the issue?

      • #5
        Maybe back out the headlamp kit, re-check the wiring at the switch for which wire goes to which terminal, and go back to stock for a baseline.

        Once rebaselined at the stock configuration and operation, then reinstall the kit.
        '74 TR6 CF13007U aka "Mr. T"
        Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
        Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
        Peaks and tweaks, but the spirit of Original
        Redlines always.
        My wife is the Driver, I'm just the Mechanic....

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        • #6
          Well if everything worked before you installed the kit and then you got smoke after you installed the kit......

          What Harris said.
          I72 Pimento w/overdrive

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          • #7
            There were no issues with the headlight kit for a couple of years. What wires, or grounds do I need to be hooked up in order for the gauge lights to operate?

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            • #8
              They are on the red wire. Do any of the lights work?

              See diagram for your year here http://www.advanceautowire.com/tr2506.pdf
              I72 Pimento w/overdrive

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              • #9
                I'm having trouble following along. Let me see if I understand exactly what you are saying (or maybe should be saying). I'm assuming the relay kit is connected downstream from the headlight switch and is triggered from the dimmer switch fed by the blue wire from the headlight switch.
                • You had an original type headlight switch with a brown, a red/green (not red) and a blue wire connected.
                • You disconnected the burnt red/green wire from both the headlight switch and the fusebox terminal opposite the two red wires.
                • You replaced the burnt red/green wire with another wire connected the same as the original burnt wire.
                • There is voltage on the new wire at the switch and not at the fusebox?
                • There is voltage on the disconnected burnt wire only when you turn on the headlight switch? Does it have voltage at both ends?
                • Is it only the instrument lights not working? Do the marker/parking lights work?

                Last edited by RatRidgeRoadster; 04-14-2019, 02:50 PM.
                R3
                Jim Herter Copperas Cove, TX
                Original Owner ֍ 1970 TR6 ֎ CC 50990 LO
                VDU 506H

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                • #10
                  I got a little further this weekend. The red wire and the red/green wire were burnt. One wire went to the wiper switch, and the red wire to the head lamp switch. The red wire was connected to the rear tail light connector. If I put power to this wire the rear light work. I have the Rheo stat jumpered. I am a bit confused about the wire going to the wiper switch. Does power go through the switch up to the gauge lamps? The schematic shows the R/G wire going directly from the headlamp switch to the fuse with a single wire. On my setup the red fuse has 2 wires, one from power, and the other into the car. I need to find the connector that takes the red power into the rheostat to power the gauges. Also I read that I should have a fuse holder wired in to protect this from happening again. Where should I place it? Also I had a 35 amp fuse in the box, I now know that's too much amperage, that's why I'm in this situation. I will follow Dan Master's guide to get the correct fuse amperage. The headlight, and front marker, and parking lights are fine, the gauges, and the rear lights are inop. Thanks

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                  • #11
                    I've broken your post down into sections and added coments. Basically, if you reconfigure the wiring as per the wiring diagram, you should be good to go.


                    One wire went to the wiper switch,and the red wire to the head lamp switch.
                    Should be red/green to the headlight switch.


                    The red wire was connected to the rear tail light connector. If I put power to this wire the rear light work.
                    That is the Multi-pin disconnect. It should have two red wires on one pin on the cockpit side of the connector. One of those wires should come from the fusebox and the other should go the rheostat.

                    I am a bit confused about the wire going to the wiper switch. Does power go through the switch up to the gauge lamps?
                    That is probably a Red/Light Green wire and the wiper switch is totally isolated from the headlights.


                    The schematic shows the R/G wire going directly from the headlamp switch to the fuse with a single wire.
                    That's how it should be.

                    On my setup the red fuse has 2 wires, one from power, and the other into the car.
                    The two red wires were originally both connected together in a single spade connector. One wire goes to the front parking and marker lights and the other goes to the multi-pin connector signified by the circled X in the wiring diagram. There should only be power at the fuse via the red/green wire from the headlight switch, when switched on.


                    I need to find the connector that takes the red power into the rheostat to power the gauges.
                    As mentioned before, it comes from the multi-pin connector.

                    Also I read that I should have a fuse holder wired in to protect this from happening again. Where should I place it?
                    See below.

                    Also I had a 35 amp fuse in the box, I now know that's too much amperage, that's why I'm in this situation. I will follow Dan Master's guide to get the correct fuse amperage.
                    Actually, the headlight circuit is un-fused. You don't want a fuse to blow on a dark rainy night driving through the mountains.


                    The headlight, and front marker, and parking lights are fine, the gauges, and the rear lights are inop. Thanks
                    All should be good if you get a replacement wire from the headlight switch to the rear of the fusebox and both red wires on the front.



                    I'm attaching a Facia diagram that might help with wiring behind the dash.

                    74-75FaciaR1.pdf
                    Attached Files
                    Last edited by RatRidgeRoadster; 04-16-2019, 02:30 AM.
                    R3
                    Jim Herter Copperas Cove, TX
                    Original Owner ֍ 1970 TR6 ֎ CC 50990 LO
                    VDU 506H

                    Comment


                    • #12
                      Thanks, your explanation is well done! All I have to do is execute the instructions. I will need replacement wire. Dan Masters says go to British Wiring. The Red wire seems to have 16 wires and approx 14 gauge. I have some 24 strand 14 gauge wire. Will that do? Or do I need to find exact replacements? Also the fuseable link would be for the dash, and gauge lights. Should i put in a link and where? Also how do you recommend to jumper the rheostat, I have the later model. What I did seems to be a bit dicey, but now I have it exposed and would like to do it right. Also I saw a post somewhere about using LED light strips inside the tach and speedo, and wiring into a bulb socket. Have you seen this done? Thoughts?
                      Thanks Jim

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                      • #13
                        The red/green wire as well as the red wires are all 14 strand British wires that are equivalent to 18 AWG US wires. The 14 AWG wire you have will do fine.

                        The parking/marker, tail and instrument lights are already fused at the fusebox. It is only the headlights and the red/green wire that are un-fused.

                        To jumper the rheostat, you just need to connect wires 9, 10 and 11 in the Facia diagram together. This could be done with any of the adapters shown below.

                        There are a lot of different LED conversions discussed here on 6-Pack, but I haven't felt the need. My instruments are not very bright, but that's the way I like them.

                        Last edited by RatRidgeRoadster; 04-16-2019, 10:25 PM.
                        R3
                        Jim Herter Copperas Cove, TX
                        Original Owner ֍ 1970 TR6 ֎ CC 50990 LO
                        VDU 506H

                        Comment


                        • #14
                          Thanks Jim, I will post the results.

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                          • #15
                            Okay, back under... one the dbl red fuse, I have one wire to the headlamp switch, and the other to nothing, I get headlamps,gauge lamps,tail lights, no marker lights, . The yellow wire (single) if I hook up this wire to the headlamp switch I get marker lights, headlamps, no gauge lights, or tail lights. If I have the red wire hooked up to the switch, I also get the tach and speedo lights, if I ground them. I need to find out where the loose red wire goes, the yellow wire was to replace the red/green wire. If you look at the pics I have a red wire that comes from the wiper motor, if I put power to it the wipers work. There are two connectors in the footwell. There are 2 red wires coming out and one coming in. In addition I have a purple and black wire that has a bulb attached that I think is the oil light, and the other end seems to go to the engine block. There is no power present on this wire. I am sure i am not getting power to the appropriate connector.The headlight switch seems to supply power, but I'm not sure. Thanks

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