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Blix's 620 WIP

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datto62073 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datto62073 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 12:45pm
Its already getting an aftermarket relay system. I learned that one is needed in these trucks years ago. All I want the OE one for is the triggers for the relays. it just seems figure out the switch for the life of me. 

Also am going to use as much of the original harness as can. I have a whole lot of $$ to be throwing at this beast so ripping out wiring is not really an option.
1973 620 L20b 5SPd
1973 620 L20b 4SPD
1978 620 KC (parted)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 1:31pm
Ripping it out doesnt mean that you cant re-use it. I always put my wire in a big box and pull out pieces as needed. If you really want your headlights to be safe and work properly you may have to spend some $$  to get a roll of wireand maybe a few new known good relays. Im not talking about 500$ but you cant use old burned up, spliced garbage. An aftermarket relay system is NOT needed, the factory system works fine. The real question is this, WHY did the previous owner hack up the headlight wiring if there wasnt a problem to begin with? Thus, instead of the headache of trying to figure out someone elses hack job, Start fresh and do it properly. You will find that in the long run you will be miles ahead. And you will have the satisfaction of knowing its done right. You wont be driving @ night hoping that your repair of the hack will hold. Youc an drive with piece of mind.  Now for the next question, Do you have a good digital multi-meter?   If not go buy one, its a necessary tool especially when working on wiring on these old trucks. Youc an find a really really nice one for 20$ 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 1:45pm
    Why would you want an oem relay to trigger another relay? I dont think I have ever heard of relaying a headlight relay. If you having issues with the harness, print out the diagram on the www.olddatsuns.com take your harness out, unwrap it and go through every single wire. It doesn't take very long and you can look for cuts, splices, bare wires, burned wires, extra wires etc. just get a clean space on the garage floor. It will take you about 2 hours. You can also test continuity on each wire to ensure there isnt a break somewhere. Then after you have inspected everything you can add whatever circuits you need and then re wrap the harness and install it. Dont try to cut and splice your harness in the truck. You need to have it out so you can trace each wire. It sounds involved, and it is, but dont worry its not hard, we can walk you through it.    

Edited by Braden620 - 31 Oct 2011 at 1:46pm
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datto62073 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datto62073 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 2:00pm
No, the real questions here are, who said anything about the harness being hacked up, spliced, burnt up garbage? 

There's nothing wrong with the lighting system short of missing the OE relay. oh and I have done  ALL the electrical repairs on my 620. so yes I do have a good multi-meter and am not stupid when it comes to wiring.this will, once its done, be the 6th relay system I have built.


THERE IS NOTHING WRONG WITH THE HARNESS!!!!!!!!!!!!!  i have no need, want or desire to pull the harness to find absolutley nothing wrong with it. 

I have the diagrams for this truck, have been looking at them and they show one hot to the OE relay, one ground from the HIGH beam switch and 2 output, one high one low. those would use as a TRIGGER for the new relays, or is this not something that is possible???? oh wait, it is. because how the setup in MY truck is.


Edited by datto62073 - 31 Oct 2011 at 2:04pm
1973 620 L20b 5SPd
1973 620 L20b 4SPD
1978 620 KC (parted)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 2:24pm

You did say that "someone in their infinite wisdom"  removed the factory headlight relay, this should imply that some type of splicing and cutting was done to fit an after market relay which you stated didn't work, then you yourself added another relay with a separate trigger wire (not needed) and you were drawing more than 30 amps through it. I wasn't trying to insult your knowledge of wiring. The reason I asked about the multi meter was because you gave no specific information in your original question about you testing individual wires etc. You also stated that you "thought" the relay was bad, I figured if you had a multi meter you also knew how to test relays and that you would have done so. Just because you think your harness is fine doesn't mean that it is. I have seen hacked up harnesses work fine and other that have never been touched and you could assume everything was fine not work at all. These trucks are 30+ years old. If you want any reliability out of them it is perfectly ok to dis-assemble things to check them out. You would be surprised @ what you might find.   I understand your frustrated, but after all YOU were the one who asked for help. Its up to you to use the advice you are given. Im just here to help you. The more detailed you can be in your questions/ descriptions, the more detailed I myself and others can be with our answers.  

Take a breather, Take some pictures, and get back to us. Maybe Beebani can chime in, and maybe he can point out the details in your circuit.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Blix Quote  Post ReplyReply Direct Link To This Post Posted: 31 Oct 2011 at 11:21pm
No relay was in the truck when we got it. So the wiring is sound and not cut up. we will post pictures later all we need it the OE relay to plug in and the head lamps should work. all the rest of my lighting works.
Blix Blix big D!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datto62073 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2011 at 2:01am
Ok, let's  try this again. 

A PO pulled the OE headlight relay, so no lights. I wired the hadlights how Beebani said to in his writeup. they worked but the highs and lows stayed on until the highs were switched on, then the highs went out due to how the switch is setup. 

I wired up a 5 pin NO/NC relay and it kept popping fuses. Bad relay was the fault there. I also messed up the wiring at the relay and smoked the wire at the switch ONLY. I took the switch apart and soldered in a new lead and rewired the NEW 5 pin relay.  with the new 5 pin relay and new wire for the switch, the headlights DON'T blow fuses and work PERFECTLY!!!!!!


Edited by datto62073 - 03 Nov 2011 at 2:31am
1973 620 L20b 5SPd
1973 620 L20b 4SPD
1978 620 KC (parted)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2011 at 9:47am
Sweet, I'm glad you got it figured out, I hate it when you know everything is setup right and one little tiny thing is screwing everything up, I spent 3 hours last week trying to figure out why one of my turn signals wouldn't work even though they were getting current. I traced it back to the switch and I swapped in a NOS switch, then I lost my other turn signal!!! the switches ended up being both bad and I took one apart and cleaned up the contacts with sandpaper and they started working fine. Thats what I like about these trucks, you can take pretty much everything apart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datto62073 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2011 at 1:04pm
Yup, that's why I like em. oh and to top everything off, with the help of Z car switches, the dome light now works with the door. I will be making a Y harness so can have both doors actuate the light but for now the drivers door works. I LOVE IT!!!!
1973 620 L20b 5SPd
1973 620 L20b 4SPD
1978 620 KC (parted)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote datto62073 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Nov 2011 at 4:00pm
Itts been a whiiile siince workked on thhis thing. and mind the double letters, my blackberry is screwing up and adding letters whhere they shhouldn't be. 

Any ideas on installing the windshheild???? New seal but its giiving me greif. I am abouut ready to have someone do it just so I ccan finishh putting this beast together. 
1973 620 L20b 5SPd
1973 620 L20b 4SPD
1978 620 KC (parted)
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