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HybridZ

1970 240z

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About 1970 240z

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    Arizona

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  1. It was back in December 2018 that I have mine repaired, but I believe it was around 150$. The coiled wires around circuit board on mine were damaged. He wasn't able to fix the fuel light at the time because he didn't have the correct Thermistor information. All he was able to get was the ford unit as described below, but ford's operate on a much lower voltage so they overheat and burn up in a Datsun. Disclaimer: Below is what I did, if you choose to do the same or similar thing it is at your own risk. Remember that fuel and it's fumes are flammable and dangerous! My gauge light "canister" on the sender was shot, so I bought a ford unit (I tested the fords away from the fuel and it's thermistor was too low of voltage, it burned up on the Datsun so DO NOT have it around fuel and plug it in!) , I opened up the canister and replaced it with this thermistor below, it's been working great since December 2018. Test your new Thermistor setup thoroughly before installing it into your tank just to be sure that it doesn't over heat and works properly. I sent my Thermistor info to Bob's Speedometer, so he maybe able to fix the light in house now. DESC: THERMISTOR NTC 1KOHM 3972K DISC Amphenol Advanced Sensors / RL2004-582-97-D1 Ford Canister: https://secure.cougarpartscatalog.com/fm-ef008a.html
  2. Had my 77 sender repaired by: https://www.bobsspeedometer.com/1/120/services.asp
  3. I saw this when it posted, that's when I decided that I have resourced so much info here and enjoyment that I was indebted to HybridZ, I immediately donated and have donated since. It is soo unfortunate that photo bucket robbed the forum of so much visual information that was present.
  4. I just pulled the dash on my 77 project and thought I'd do some headlight circuit testing. This car has the OEM style headlight bulbs. With the Key Off, Turn sign switch and headlight switch fully removed, I get no power to the fuse box as expected. I connected only the Red wire and the White/red wire to the Headlight switch. With the Headlight switch off there is no power to the fuses as expected. Turning the Headlight switch fully on and there is power to the fuses as expected. Checking the power at the round Sub-harness connector of one headlight (in this case the left side) I had power at each of the 3 wires, not expected. I realized the power is routing through the right-side bulb which is still connected. To verify I disconnected the Right-side Sub-harness, this removed power from both the Low & High Beam wires at the sub-harness connectors. I still had 1 wire with power (Red on the right & Red/yellow on the left) in each Sub-harness connector as expected as these wires are coming from each of the two fuses. At this point I reconnected both Sub-harnesses. At the column, in the 6-pin connector, I temporarily grounded the Red/black which activated the Low Beams, I moved over and then grounded the Red/white which activated the High Beams as expected. Keep in mind that I still ONLY had the Red wire and the White/red wire connected to the Headlight switch, no other wires and key was off. See if you get the same results. On a side note, I actually had an experience where BOTH headlights were burned out, likely from a voltage regulator issue causing over voltage. Look closely at your bulbs to ensure that you aren't having a similar issue with the High Beam circuit.
  5. Looking again at the schematics, there is a wire branching off of the right headlight wire after leaving the fuse to feed the High Beam Indicator bulb located in the speedometer. The ground side of the High Beam Indicator connects to the High Beam ground wire circuit (Red/white wire) "the fatter one, that reads low" so it will always have some small amount of voltage due the small amount of power passing through the bulb, so I would say your 0.8v would be expected there. For the right head light, the Red wire should be the only wire with near full battery voltage, For the left head light, the Red/yellow wire should be the only wire with near full battery voltage. Interesting data collected from my 1977 with all switches connected. Battery Voltage = 11.94v (engine & Key off). Ltf Headlight Sub-harness connector: Rt Headlight Sub-harness connector: High Beam: R/y=11.88v High Beam: R=11.87v R/w=.12v (won't light a Test Light) R/w=.14v (won't light a Test Light) R/b=.00v R/b=.00v Low Beam: R/y=11.92v Low Beam: R=11.92v R/w=11.92v (lights Test Light but is less bright than R/y) (likely less amps) R/w=11.92v (lights Test Light but is less bright than R) (likely less amps) R/b=.00 R/b=.00v I don't have a reason yet for the higher volts but lower amp 11.92v R/w on Low Beams vs .12v on High Beams, other than I'm sure it's feed back from a circuit in the switches. I thought I would share this to see how it corresponds to your results. I am running the stock headlights though all my other lights are LED.
  6. I could go for a couple of shirts and stickers too if they're offered again.
  7. I suggest putting your stock headlight bulbs in until we can get both hight & low beams working correctly. That would remove the led variable from the equation. Did you check voltage at the headlight bulb connector or at the headlight sub-harness connection (round connector) at the inner fenders? There are two Sub-harnesses, one for each headlight just on the inside of the fenders near the radiator bulk head. That round connector at the sub-harness can get tarnished and need cleaning, resulting in too much resistance. Power runs from the fuses (one for each headlight) through the C-4 (White) connector located in the passenger foot well (see pic), through the engine bay harness, then through the headlight sub-harnesses, to the headlight bulbs. 1) Clean the Fuse connections well. What is the voltage at the fuses? 2) Clean the C-4 (White) connector located behind the white mount up in the passenger foot well, check voltage here. (Red/yellow=Lft headlight & Red=Rt headlight). With this connector disconnected you should have no power to the headlight bulbs. 3) Clean the Sub-harness connections as well and check voltage. Are you getting only one 12v power source at each of the Sub-harness connectors? Each of the connectors contains two grounds (high & low beams) and one 12v (pwr from the fuse box; Red/yellow=Lft headlight & Red=Rt headlight). 4) What is voltage at each of the headlight bulb connectors after cleaning & testing through steps 1-3? Do you have multiple 12v power sources here but not at step 2? It's normal to have a little voltage drop as we go along the harness, but it shouldn't be excessive. Refer to the previous diagrams for wire colors as needed.
  8. Lets try removing the Turn Switch out of the equation; 1) unplug the 6-wire connector from the switch but leave the Black Ground wire running between the two in tack. Did this remove the "extra" power from the Headlight plug? 2) With the Headlights off ground the Red/black wire on the harness side (see diagram above for location). 3) Turn the Headlight Switch to the "on" position, do you have Low Beam lights? 4) If so, then the Turn Signal switch is suspect and likely needs to be opened up and have the contacts cleaned.
  9. Looks really nice! I'm building another car and am considering those flares too. I can't wait to see your beauty with the wheels on to fill out the new flares! I too went with the cut bumper when I did my car! 👍
  10. Beautiful! Nice color! The body work looks really really good, very straight.
  11. Also, I corrected my basic troubleshooting, the fuseable link servicing the headlight switch is the outer/front fuseable link.
  12. The fuse box "headlight" circuit (see diagram earlier in posts) has a White/black wire feeding to it from the Ignition relay & Fuel Injection so power could be coming from this circuit and back feeding back up to your switch if your key is "On". The High Beam position is likely providing a grounding route, the Low Beam position may have tarnished contacts and may not be completing the ground. I think we should focus on getting power to your large White/red stripe wire at the column. There is a 6 wire connector at the passenger foot area against the firewall. It is likely behind the plastic mount for the Dash harness connections, its possible this connection is dirty.
  13. You can bypass the High/Low switch to confirm the headlight circuit is working properly.
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