Nas Posted January 10, 2010 Report Share Posted January 10, 2010 I went to go take the truck out, and my headlights wont turn on. The parking lights work, but when i pull the lights switch all the way out to headlights, nothing happens. I checked the fuses and none look burnt out. There is a wire hanging free that I didnt notice before. Its a thick red wire spliced onto a thin brown wire that I traced back to the wiper switch. I dont know much about electrical systems, so Im stumped. Quote Link to comment
datzenmike Posted January 10, 2010 Report Share Posted January 10, 2010 Yeah that Red wire should be connected to the front right hand 15 amp fuse. Quote Link to comment
1974datsun Posted January 10, 2010 Report Share Posted January 10, 2010 i have the same problem, but my high beams work but my lowbeams dont work. wtf!!!!!!! Quote Link to comment
DanielC Posted January 10, 2010 Report Share Posted January 10, 2010 There is a relay that switches from low to high beams. If one set works, and the other does not, check the relay, and the connections on it. Quote Link to comment
Nas Posted January 10, 2010 Author Report Share Posted January 10, 2010 Thanks for the quick reply! Yeah that Red wire should be connected to the front right hand 15 amp fuse. I am here in the truck now. There are 2 rows of 3 fuses. I assumed you mean the top right hand fuse. In the back of the fuse box, there is a white plug going into the box with a green wire on top, and a hole on the bottom. I stuffed that red wire into the hole and tried again, but nothing. What am I doing wrong? Quote Link to comment
Nas Posted January 11, 2010 Author Report Share Posted January 11, 2010 Any ideas? I also ran a test wire to the headlight from the battery, and they work fine. I feel like im grounded, having to be home before dark! Quote Link to comment
ggzilla Posted January 11, 2010 Report Share Posted January 11, 2010 Turn on the headlight switch and wiggle your turn signal lever. If the headlights come on, something is loose or damaged in the T/S-high beam switch. Generally to solve this problem is not a matter of "try this, try that", but involves carefully tracing the circuits until the problem is found. I could come by and look at it with you. I'll PM you my phone number. Quote Link to comment
ggzilla Posted January 11, 2010 Report Share Posted January 11, 2010 Here is the early 620 fuse box: (same as Datsun 1200). The thick red wire goes on the underside of the box, to the 20A section. Quote Link to comment
datzenmike Posted January 11, 2010 Report Share Posted January 11, 2010 i have the same problem, but my high beams work but my lowbeams dont work. wtf!!!!!!! If all four headlights are ON and if it's your '74, (you don't say) there is a headlight relay on the rad support between the battery and rad I think. Give it a good smack. If that does not work find some way to disconnect the Red/White wire from the relay. This will disconnect the high beams but leave the low beams on. Quote Link to comment
Nas Posted January 11, 2010 Author Report Share Posted January 11, 2010 Here is the early 620 fuse box: (same as Datsun 1200). The thick red wire goes on the underside of the box, to the 20A section. Ok, this helps so much! I was pluging the wire into the parking/ tail light side, so no wonder it didnt work. Im going to go back out there in the morning and try again. Thank you ggzilla and datzenmike for taking the time to help me out. This community is the best! Quote Link to comment
Nas Posted January 12, 2010 Author Report Share Posted January 12, 2010 So just an update. I was able to get the lights working again by running a wire off the switch, to the fuse box. The red wire I mentioned before was all wrong. It was randomly spliced into an unidentifiable wire somehow mated to the washer switch. Oh, and it was just twisted, not even taped up. Scary. Of course during the battle, I somehow disabled my gas gauge and turn signals. *palm to forehead* At least I got home safely. Thanks again to datzenmike for lending expertise, and to ggzilla who talked me through the procedure and didnt get too frustrated with me. Quote Link to comment
ggzilla Posted January 12, 2010 Report Share Posted January 12, 2010 Glad to hear it's working. Should be safer and more reliable now. Last time I worked under the dash, my tach stopped working. And my heater fan. I should really get out there and fix it... Quote Link to comment
justinschlaht Posted July 13, 2023 Report Share Posted July 13, 2023 hi i have a 1976 datsun 620 im having problems with my wires for my lights so i have new back tail lights hooked up which i have unplugged at main point and have also unplugged under the passenger seat now my problem is when i turn on the lights all for head lights turn on low and high beam i have changed the switch and i have tried other signal switches as well and also different flashers and have no side maker light as they have bin deleted i have changed all the fusses i have tried other relays as well when its all plunged back in i have still the 4 lights on the front marker lights both stay solid and the back light have no signal or brakes the revers lights work tho so im asking for some help is there something missing or is there like a relay not working or even one missing no i have also had all these light working before a year ago and the only thing that i have changed wire wise id i used the factory power to power up a after market deck witch i have unplugged and still does same thing still need help please i just want to drive this truck after 6 years of redoing it Quote Link to comment
620slodat Posted July 13, 2023 Report Share Posted July 13, 2023 Justin, please use some periods and capitals. I have no idea what you are trying to say as your sentences run-on with no end or beginning to them. I can only guess as to what you trying to say. Guessing is no good. Don Quote Link to comment
datzenmike Posted July 13, 2023 Report Share Posted July 13, 2023 If reverse lights work the ground is also working. Are the dash lights working? I assume they are. There is the 10 pin plug under passenger seat. Get a $5 test lamp and find the Green/Blue stripe wire and test for power with the headlights ON. This is the side marker, running lights and the license light. If power go to the right (passenger) side tail light. Behind it near the end of the frame there is a round 6 pin plastic plug that joins the frame harness from the cab to the tail light harness across the rear. Unplug and again check the Green/Blue wire for power. No power.... there is a break in the harness between here and the 10 pin connector under the seat. Look for a poorly done trailer splice or rock damage on this harness. Yes there is power.... connect up the plug. Sometimes the act of unplugging and plugging in will re seat the connection. If nothing the problem is in the harness across the back of the truck. Again look for an attempt by a previous owner to to install a plug for towing a trailer. These are never done right and water gets in and corrodes the copper wires. Do you have license plate light?????? 1 Quote Link to comment
justinschlaht Posted July 18, 2023 Report Share Posted July 18, 2023 Thanks you So what about the front when I pull the head light on the high beam and low beam are on and the front signal lights are soild . And when I try to turn of and on the high beam nothing changes and the signal light don't work either. I have tryed different flasher as well nothing.all fusses are new as well .for the side maker light I do not have them at all becouse I shaved them gone . Quote Link to comment
datzenmike Posted July 18, 2023 Report Share Posted July 18, 2023 On 7/13/2023 at 11:04 AM, datzenmike said: If reverse lights work the ground is also working. There is the 10 pin plug under passenger seat. Get a $5 test lamp and find the Green/Blue stripe wire and test for power with the headlights ON. What happens???????? This will determine what to do next. Get the rear running light and flashers working and it might fix the fronts. Quote Link to comment
banzai510(hainz) Posted July 18, 2023 Report Share Posted July 18, 2023 if everything worked before then its just backd connections and or fuse box corrossion. light bulbs or relay if you fucked with stuff and forgot what you did then its that Quote Link to comment
spencer620_datsun Posted October 18, 2024 Report Share Posted October 18, 2024 I have a 1979 Datsun 620, turn signals work parking lights work but no low or high beams, the dash beam light doesn't come on when the switch is pulled out in any position. i have checked fuses, and the switch and all the ground wires seem to be connected. i am pretty stuck and unsure what to do, help would be awesome. Quote Link to comment
datzenmike Posted October 18, 2024 Report Share Posted October 18, 2024 The high beam indicator only works if the high beams are working. Parking, clearance and dash lights are on a separate fuse. Electricity is invisible so buy a $10 test lamp, it will be invaluable later for any electrical problem. I would check the 15 amp headlight fuse first and be sure there is power on both sides. Fuses can't be trusted by looking at them. 1 Quote Link to comment
Bleach Posted October 18, 2024 Report Share Posted October 18, 2024 Exactly. I once used the high beams, they blew the fuse, and then both high and low beams were out. Quote Link to comment
datzenmike Posted October 18, 2024 Report Share Posted October 18, 2024 My '78 fuse got to hot to touch, bad grip on the clips. The heat took all the temper/springiness out of the clips making bad get worse and the odd time the headlights would go out. I used to reach down and push on the fuse to make contact and get them working, usually with a burned finger. I eventually found another box and replaced it, it was the only cure. The next model, 720, the L&R sides are fused so you can't loose all headlights. Quote Link to comment
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