Jacobs601 Posted November 28, 2015 Report Share Posted November 28, 2015 Hey, I got a 1969 521 I desperately need help with. I'm in the process of restoring this one but when it comes to the electrical, I'm not so great at it. The truck is pretty much complete but the previous owner cut the fuse box out and removed the coil and resistor. I'm having trouble trying to figure out how to wire in the new fuse box and coil. I've found all of the wiring diagrams but they are no help to me cause I can't under stand them. I think I got the coil figured out but not the fuse box. My fuse box have eight wires going into one side and four going into the other side. Could someone explain to me what color plugs to what and which of the fuses should be tied together. Or even give me a call. Any help would be greatly appreciated. I just can't understand these complicated wiring diagrams. 1 Quote Link to comment
Draker Posted November 28, 2015 Report Share Posted November 28, 2015 If you are not good with wiring, it might be worth your time to just fine new harnesses using the classifieds. Welcome! 1 Quote Link to comment
datzenmike Posted November 28, 2015 Report Share Posted November 28, 2015 I'm guessing the 'new' fuse box is a generic one from an auto supply store? 2 Quote Link to comment
Jacobs601 Posted November 28, 2015 Author Report Share Posted November 28, 2015 Yeah, just a generic autozone special. Through process of elimination, I have determined all the uses for the wires coming out of the fuse box. But the four going into it I'm not so sure 1 Quote Link to comment
DanielC Posted November 28, 2015 Report Share Posted November 28, 2015 Here is a wiring diagram, in color, that might help. There are four wires on the battery side. A wire directly from battery positive, to the fuse box. A thick white wire, this wire supplied power to the ignition switch. A black wire, with a white stripe comes from the ignition switch, is hot with the key in run position, and a second black wire, with a white stripe goes to the ballast resistor. A black wire, with a red stripe then goes to coil positive. This page has some pictures of a new blade type fuse box installed in a 521. http://community.ratsun.net/topic/49698-my-dragon-datsun-521/page-5 2 Quote Link to comment
Jacobs601 Posted November 28, 2015 Author Report Share Posted November 28, 2015 Thanks Daniel, I think that pic will help. Let me wire it up and give it a shot. Wish me luck. 1 Quote Link to comment
Jacobs601 Posted November 28, 2015 Author Report Share Posted November 28, 2015 Any suggestion on the white blue wire on the battery side of the fuse box. What is this one? 1 Quote Link to comment
DanielC Posted November 28, 2015 Report Share Posted November 28, 2015 There two sides of the fuse box. One is always hot, the other is ignition switched hot. The white with a blue stripe wire is ignition switched on power to the voltage regulator. That is one of the errors in the wiring diagram above. 2 Quote Link to comment
DanielC Posted November 28, 2015 Report Share Posted November 28, 2015 There are some ground wires that tend to removed in 521 trucks, over the years. This is a negative battery cable. The big lug goes to bolt by the fuel pump, NOT a fuel pump stud. This grounds the battery to the engine. The pig tail with the small eye goes to the alternator frame, to ground the alternator. The battery end of the cable above. There is a second black wire, connected to the alternator frame. This wire goes to the voltage regulator, and is on one of the bolts that hold the voltage regulator to the inner fender. It you remove the voltage regulator, and replace the externally regulated alternator with a more modern internally regulated alternator, this ground wire from the alternator frame to the inner fender must remain in place. If you lose the cab sheet metal to engine ground connection for any reason, the cab will ground through the throttle cable, and destroy it. The engine needs to have a good ground to the truck's frame. The cab also needs a good ground to the frame, you cannot and should not depend on the cab to frame bolts for this. This is the function of the wire from the alternator frame, to a voltage regulator mounting bolt. If you have unusual tail light problems, often they can be fixed by running a ground wire from each tail light frame, to the frame under the bed. This a picture of the battery to fuse box connection. This is a picture of connections to a 521 fuse box. This extra orange wire, with an inline fuse feed power directly to a extra relay, by the original headlight relay. This is that extra relay. The orange wire goes to pin 30 of the added relay. The red with a yellow stripe wire on the original headlight relay goes to pin 86 of the added relay. You ground pin 85 of the added relay. Then a short jumper connects pin 87 of the added relay to the empty pin on the original headlight relay. 3 Quote Link to comment
Jacobs601 Posted November 28, 2015 Author Report Share Posted November 28, 2015 Thank you so much for your help Daniel. I got her running last night. 1 Quote Link to comment
DanielC Posted November 28, 2015 Report Share Posted November 28, 2015 Jacob, That is good the truck is running. Get the brakes working too, trust me. This is what you owe the Ratsun community for help getting your truck running. PICTURES! 2 Quote Link to comment
Jacobs601 Posted November 29, 2015 Author Report Share Posted November 29, 2015 IMG_3913.JPG.jpeg 1 Quote Link to comment
DanielC Posted November 29, 2015 Report Share Posted November 29, 2015 you need to use a remote photo sharing site, and put the IMG code in your Ratsun community post. See this thread: http://community.ratsun.net/topic/691-how-to-post-pictures-and-keep-online-photo-albums/ 1 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 1 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 2 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 1 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 Ok, here's a few pics of my 521. I'll try to get some more later. 1 Quote Link to comment
EastBay521 Posted December 3, 2015 Report Share Posted December 3, 2015 69 with a L series. I like. 1 Quote Link to comment
banzai510(hainz) Posted December 3, 2015 Report Share Posted December 3, 2015 weid looking fuel pump PS I like the Blue Patina I would just buff it out and roll as is 1 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 Yeah, I dig the old rusty dusty look too. I think I wanna steel wool off all the big rust and clear over it. How long do you think that would last before it started rusting back through? 1 Quote Link to comment
banzai510(hainz) Posted December 3, 2015 Report Share Posted December 3, 2015 depends on weather. Like hear you have the eastern washington Or arizona surface glaze rust and that will be OK for years then there is a Humid Hawaiian salty air rust and eats from inside out. is from salty road rust. Bad!!!!!! I would just buff it ou then waxit and see what it does. This is just me. 1 Quote Link to comment
Jacobs601 Posted December 3, 2015 Author Report Share Posted December 3, 2015 Sweet, I'll try it. 1 Quote Link to comment
Jacobs601 Posted December 6, 2015 Author Report Share Posted December 6, 2015 Ok dudes. Can someone tell me we're these two wires should be going to. They're coming out of the part of the harness that has the plug to the alternator. 1 Quote Link to comment
banzai510(hainz) Posted December 7, 2015 Report Share Posted December 7, 2015 OK you got the drawing on the first page, This is EZ get a meter and ck it out. If it has the round lug its the + output of the alt. you can ohm ck this with a meter ands it will go to the voltreg and the batter post. its the commom positve wire. ck with drawing. My 521 the wire will be wht. red sripe but i think goes solid white soemwhere under tape. YOu have a early 521 as it has a funky harness to the alternator. Some have cable harness adapters when you get it for a 69 dont throw that alt away intill you knw a new one with work (u can get it rebuilt. 1 Quote Link to comment
Jacobs601 Posted December 7, 2015 Author Report Share Posted December 7, 2015 Great, thanks. I've rebuilt my alternator already. I do ok with the mechanical but when it comes to electrical diagrams, it might as well be Chinese arithmatic. I'm gonna keep plugging until it works. It's a running and before to long I'm gonna be driving. Thanks for yalls help. 1 Quote Link to comment
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