SteveJ

Try the Z Car Garage in San Jose. http://www.zcargarage.com

It sounds like your voltage is getting too low. Is it an internally or externally regulated alternator? If it is externally regulated (stock), test it per the BE section of the 260Z FSM. If car has been converted to use an internally regulated alternator, test per the BE section of the 1978 280Z FSM.

Thank you, @kats, for taking the time to post these diagrams. They are of excellent quality.

Okay, I'm tracking with you now. There should be differences between the US and JDM wiring, and I do not know if any of the differences are in the turn signal or headlight circuits. @Patconcould be pointing you in the right direction on grounding issues. When you use the turn signals and the headlights come on, are they normal brightness or dim? Can they change between high and low beam? @kats Do you have a source for the Japanese wiring diagram that you could post?

The contacts should be closed.

The brake light circuit is interrupted at the turn signal. It is after the hazard light switch. Since you said your right turn signal works, it is most likely the turn signal switch. https://fiddlingwithzcars.wordpress.com/2012/12/04/turn-signal-repair/

The turn signals will not work when you are using the hazard lights. The switch for the hazard lights cuts off the power to the turn signals. What do you mean by "headlights come on solid"? Also is this a genuine RHD JDM Z?

I had to pull the trigger, too. Thank you, @Zed Head for the info!

You will have to track the circuit all the way through. Something got rewired somewhere. If you have 12VDC on each leg going out of the turn signal switch, continue tracing it down the line, such as at the C3 and C4 connectors between the dash harness and other harnesses. Also, you said you are "pretty sure" the flasher relays are good. Why do you think they are good? The hazard circuit especially seems like the flasher is not good or there is not enough load in the circuit for the bimetal strip (if it's an old relay) to work. There could to be things going on in the wiring that you do not see or do not recognize as being different/wrong. Please go back through this thread and look for questions I asked that you did not answer. There are pieces to this puzzle that are missing.

So, is the turn signal switch a 76 or 77 switch? I see that the hazard switch is for a 77. Do you see any splices in the harness where the 77 connector(s) was(were) put in? Please note that the wire colors in the wiring diagrams applies ONLY to the wire harness. Sometimes components have wire colors that differ from the wire harness. I have disassembled and reassembled both types of switches. https://fiddlingwithzcars.wordpress.com/2013/07/11/late-280z-turn-signal-switch/ https://fiddlingwithzcars.wordpress.com/2012/12/04/turn-signal-repair/ You can see they are designed completely differently. There are only 3 wires going to the 280Z turn signal switch: positive 12 VDC, left and right. On the 240Z there are 6 wires.

Now you have me confused. What 77 switches did you put in your 76? How did you get the incompatible connectors to connect?

I believe the connectors are different between the 76 and 77 turn signal switches. Please post photos of the connector on the turn signal switch and the connector in the body harness. Try to get the wire colors, too. Also, are you using incandescent or LED bulbs in the car?

The routing on the 73 & 74 is on the right side of the transmission tunnel and crosses over the valve cover. If you get stuck finding it, let me know, and I can supply a photo.

The 280Z did not combine the functionality of the brake light with the turn signal, so you wouldn't need those modifications. Let's break this down. First get a copy of the factory service manual (FSM). I believe you can find it in the downloads section. Page BE-10 has a break-out of the turn signal wiring. Page BE-11 has the hazard lights. Please note that the hazard switch will break the turn signal circuit. The turn signal flasher unit is a good place to test. Unplug the flasher and see if you have 12 VDC to ground at the green wire with the white stripe. If you do, plug the flasher unit back in and measure voltage at the white wire in the dash harness where the turn signal switch plugs into it. That should also be 12 VDC to ground if the previous measurement was good. For the hazard lights not flashing, I would just start by changing the flasher unit. Be careful if you have to use a 3 prong flasher unit as those require you to run a ground wire in addition to the connection in the dash harness. Those units are also picky about line and load side of the flasher unit.

Is this a North American spec car?

Please provide more details. Is the light coming on but not blinking? Do your hazard lights work? Are the lights not blinking in the front, rear, or both?

http://zcon.org

There could be a cross connection issue, or it could still be the turn signal switch. This isn't something that is plug and play to fix. The good news is that if you have a friend who is good with using a multimeter and reading wiring diagrams, he could take that link I sent you and diagnose the issue.

It's most likely the turn signal switch. https://fiddlingwithzcars.wordpress.com/2013/01/20/hazard-switch-brake-light-turn-signal-circuit-analysis/

I tried to walk over to your car, but you got in and moved away.

Considering how much of a BRE fanatic Randy is, if that car had been in attendance, I would have heard about it.

Welcome to Z car ownership. I got to drive my 74 a lot this past week. However, on Wednesday, I was at Road Atlanta, and a friend was trying to help me adjust the striker plate for the door lock. Then the door lock broke. I had to borrow a car to drive home to steal the lock of my 73. It's frustrating when something breaks, but it feels SO good to fix it and get back on the road. Check the pH of the coolant. It might be acidic. I hope it's not combustion gasses getting in.

From what I read on Facebook, the Rabbit was more of a victim than a perpetrator. Look for the Remembering the Old Road Atlanta group on there. (Thanks for letting me know about that group, Rob @conedodger)

The Rabbit died. The driver only received minor injuries. (Photos downloaded from Facebook except the "before" photo)

Look at my photos closely once I get them all posted. You'll see a lot of cars picking up the right front through 10B