620 oil, beam chrg and brake light in the cluster.

[thestrangebro]

ive looked over the forums and i either looked over it or just couldnt find it. but none of those lights work. i have checked the fuses and they are fine. any ideas?

[yello620]

Pretty sure that all those lights have the same ground in common. The wiring diagram for your 620 can be found at olddatsuns.com. 

[datzenmike]

Do your back up lights and turn signals work??? If no, then the fuse IS bad. Replace it.... never trust to looks

alone. It's the bottom left one.

 

 

 

Well the bulbs could be burned out... very unlikely or the cluster was swapped and this one didn't have the bulbs in it. I guess the plug in the back of the gauge cluster could be loose or bad contact. You could remove it and plug back in several times to clean and make better contact.

[thestrangebro]

yeah my turn signals and brake lights work. its just that whole right gauge doesnt work. except the fuel. is the ground of all of these the silver box bolted above the battery? thats grounded.

[datzenmike]

Not how they work. The E brake switch grounds the bulb to turn it on. The oil pressure sender grounds when pressure is low and that turns the bulb on. When the alt is not charging it grounds the bulb in the dash and this lights it.

 

Power goes to the dash and to each bulb then a wire to elsewhere on the car where it is grounded to turn it on. This is why I asked about your back up lights. These bulbs are fed from the same fuse (well except the hi beam) This is also why I suggested unplugging and plugging in the plug on the back of the gauges to perhaps make better contact.

[thestrangebro]

oh i get it now. ill trace the wires and see whats up. also the heater doesnt work, could that be as simple as in the cab wiring like the gauge problem im having?