have not check into it, only things i assume that can be at fault would be the relay or the switch. 

IIRC the floor temp lignt was on in both ON and START, would stay on for a few seconds after engine running, then would go off.

this is a Cali car with the cat light as well that works as it should, only on during start to test the light.

I will do a check of continuity tomorrow, but if the floor temp switch is bad, I found this

uxcell KSD301 Thermostat 100°C/212°F 10A Normally Open N.O Adjust Snap Disc Temperature Switch 2pcs - - Amazon.com

looks about right. could not find the correct PN in the car parts manual site, so not sure how to find an OE switch. 

 

oh sometimes it works perfect, only lights during crank off as soon as key released to ON after starting. Cat light work perfect every time, only on during START, off as soon as key released to ON. 

Edited July 18, 20222 yr by Dave WM

@Dave WM I think you'll find the part numbers on this page: http://www.carpartsmanual.com/datsun/Z-1969-1978/electrical/electric-unit-switch/section-2/280z.

Start around part 31 and work your way down.

Be sure to go to figure 2 of 2.

thanks Steve, found it but NLA dang it....

 

25090-H7310 - Sensor, Floor - Genuine Nissan Part (nissanusa.com)

Color me unsurprised. There's only so long a manufacturer can support obsolete technology. I'm usually surprised when something is still available.

indeed, is suspect modern cars will suffer even more with NLA as they age, the upside to this era is at least there is not a LOT of electronics and what it does have is pretty simple with possible work arounds (like the sensor in the amazon add).

ok since it has been an intermittent issue, I think I will start with just jumping the floor switch. IF the light still acts up (stays on when not cranking) I can assume my relay is at fault. This beat me trying to do continuity test with intermittent devices.. I will just keep an eye on it for a few weeks to see how things go.