d.p Posted March 24, 2017 Report Share Posted March 24, 2017 I bought a new one on the bay and its different, I can only assume it was for a J13 engine? The bar on the new one is 2x3 wide, the old one is 2 and 4 wide. Also looks like different amperage fuses as well. Can anyone confirm l16 521 fuse ampers? I really only bought it to get the screw on cover but it appears the screw broke off in the box on mine so I can't even use it. :( I thought about switching the bars from the old to new but wasn't able to get them out. Anyone know how they come out? 1 Quote Link to comment
flatcat19 Posted March 24, 2017 Report Share Posted March 24, 2017 They are riveted in there. You can make a little jumper to make it work. I switched to a modern fuse box last year and couldn't be more pleased. 2 Quote Link to comment
DanielC Posted March 24, 2017 Report Share Posted March 24, 2017 Datsun 521/L16 trucks had at least two different fuse boxes. Earlier 521's had three always hot fuses, and three ignition hot fuses. Later 521 trucks had four always hot, two switched fuses. Are you trying to keep the stock fuse box, or are you just want the fuse box to work? See this page for info on a modern blade type fuse box I put in one of my 521 trucks. http://community.ratsun.net/topic/49698-my-dragon-datsun-521/page-5 1 Quote Link to comment
d.p Posted March 24, 2017 Author Report Share Posted March 24, 2017 Mine works fine I just wanted a working cover. So I just swapped the hot and switched fuse bars from the old to the new fuse block. Should be golden now. Can someone confirm the fuse sizes in the later L16 521? 1 Quote Link to comment
flatcat19 Posted March 25, 2017 Report Share Posted March 25, 2017 Factory wiring diagram lists fuse ratings in order. 1 Quote Link to comment
DanielC Posted March 25, 2017 Report Share Posted March 25, 2017 (edited) This is a wring diagram of a "four always hot" fusebox. It shows a 15 amp fuse in the headlight position, but stock headlights are 50 watts, and 37.5 watts on high beam. That is 175 watts total, divided by 12 volts equals 14.5 amps. 12 gauge wire is good for 20 amps. 10 gauge wire is good for 30 amps. An easy mod is to add an extra cube Bosch type relay by the original Datsun headlight relay. Run a separate fused power wire to the new relay, use the red with a yellow stripe wire from the original relay to trigger the new relay, and get headlight current out of the original Datsun fuse box. Fused power to pin 30 of new relay. Use at least 12 ga wire, or 10 gauge. Original red with a yellow stripe wire to pin 86 of new relay. Ground pin 85 of new relay. Run a short jumper wire from pin 87 of new relay to the place that is empty on the original headlight relay. Edited December 28, 2019 by DanielC Photobucket shenaganians 1 Quote Link to comment
d.p Posted March 25, 2017 Author Report Share Posted March 25, 2017 So according to that its 10,15,10,15,15,15 for an L16 521? 1 Quote Link to comment
wayno Posted March 25, 2017 Report Share Posted March 25, 2017 So according to that its 10,15,10,15,15,15 for an L16 521? That's what it looks like on that wiring diagram. 1 Quote Link to comment
DylanLes Posted April 30, 2017 Report Share Posted April 30, 2017 They are riveted in there. You can make a little jumper to make it work. I switched to a modern fuse box last year and couldn't be more pleased. Which block are you using now? 1 Quote Link to comment
flatcat19 Posted April 30, 2017 Report Share Posted April 30, 2017 Which block are you using now? https://www.google.com/search?q=blue+sea+fuse+box&client=ms-android-motorola&sa=X&biw=412&bih=604&tbs=vw:l,ss:53&tbm=shop&prmd=sivn&srpd=5470086500239957308&prds=epd:8341960532785450498,cdl:1,cid:13865614124180832738&ved=0ahUKEwjahobw8czTAhVKzIMKHb3ECKMQgTYIkAQ 1 Quote Link to comment
Greaser2 Posted December 28, 2019 Report Share Posted December 28, 2019 Been looking for a new L16 fuse block, a 4 constant 2 switched block. Anyone know where they can be purchased? 1 Quote Link to comment
bilzbobaggins Posted December 28, 2019 Report Share Posted December 28, 2019 Lmao, i have been researching this for the last 24 hours. So far, no leads. 1 Quote Link to comment
d.p Posted December 28, 2019 Author Report Share Posted December 28, 2019 For real buy the same one I did and move the bars to match your stock one. Which is what I did back when I started this thread with 0 issues. Quote Link to comment
d.p Posted December 28, 2019 Author Report Share Posted December 28, 2019 https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F113150964287 Quote Link to comment
mainer311 Posted December 28, 2019 Report Share Posted December 28, 2019 Get an ATC fuse block and just mod it with jumpers to match the original. Quote Link to comment
DanielC Posted December 28, 2019 Report Share Posted December 28, 2019 I would suggest a ATC fuse box also. Glass tube fuses have a tendency to look OK, but be bad. Quote Link to comment
bilzbobaggins Posted December 28, 2019 Report Share Posted December 28, 2019 I need to figure out if mine was a 3/3 or a 4/2. Never had the og fuse box. No matter what, I am about certain i will extend the leads and move it in the cab. There is about a 50% less chance of it getting wet in there. 🤣🤣 Quote Link to comment
DanielC Posted December 28, 2019 Report Share Posted December 28, 2019 What is the build date on your 521? I believe the difference between a 3/3 and a 4/2 fuse box is separate fused power to the tail lights. Remove the head light fuse, it is in line with a thick red wire on the back side of the fuse box, going into the cab. If tail lights, and all the other smaller lights come on with the light switch pulled out, I think you have a 4/2 fuse box Quote Link to comment
Greaser2 Posted December 28, 2019 Report Share Posted December 28, 2019 7 hours ago, d.p said: For real buy the same one I did and move the bars to match your stock one. Which is what I did back when I started this thread with 0 issues. Define how you “switched” the bars. Looking at mine I’m not seeing how??? Quote Link to comment
Greaser2 Posted December 28, 2019 Report Share Posted December 28, 2019 5 hours ago, mainer311 said: Get an ATC fuse block and just mod it with jumpers to match the original. Which one are u recommending?? Seems to be several models. Quote Link to comment
d.p Posted December 28, 2019 Author Report Share Posted December 28, 2019 7 minutes ago, Greaser2 said: Define how you “switched” the bars. Looking at mine I’m not seeing how??? It’s been awhile but I think I just took everything from the original box and swapped them into the new box. They pop out though. Pinch the fuse holders from the top and they come out the bottom. Quote Link to comment
mainer311 Posted December 28, 2019 Report Share Posted December 28, 2019 (edited) 40 minutes ago, Greaser2 said: Which one are u recommending?? Seems to be several models. I just got a cheap one. It’s 6 separate circuits, so what I did is cut real short pieces of heavy gauge wire and soldered them into the bottom after trimming away some clearance in the plastic ribs. I basically just jumped the circuits to match the original fuse holder. Plus, there’s a bottom cover that insulates everything when you bolt it down. Auxiliary Automotive Fuse Box... https://www.amazon.com/dp/B003JPCZAQ?ref=ppx_pop_mob_ap_share Edited December 28, 2019 by mainer311 1 Quote Link to comment
bilzbobaggins Posted December 29, 2019 Report Share Posted December 29, 2019 3 hours ago, DanielC said: What is the build date on your 521? I believe the difference between a 3/3 and a 4/2 fuse box is separate fused power to the tail lights. Remove the head light fuse, it is in line with a thick red wire on the back side of the fuse box, going into the cab. If tail lights, and all the other smaller lights come on with the light switch pulled out, I think you have a 4/2 fuse box I will get the vin at some point tomorrow. Stuck at work all freaking day today. As far as going off the light switch, thats another "issue". I was sold it without one. I bought one off ebay. When I pull my switch out one click, i get headlights and tailights. If I pull it again to two clicks, all I get are headlights. I am sure I can depin it and get it back to stock, but I kinda like it this way. Quote Link to comment
bilzbobaggins Posted December 29, 2019 Report Share Posted December 29, 2019 My plate in the door jam has been painted over several times. I am going to try to get the paint off without ruining the build date. I searched and could not find a pic of a door tag. Is the build date stamped into the tag? so that I could just take a razor to it to clean it off? Here is the tag in the engine bay. So this confuses me as well. I have seen others post that PL521 serial numbers are from 207,797 to 567,872. I am guessing I have a bastard truck right around the change. But I have been wrong before. Quote Link to comment
banzai510(hainz) Posted December 29, 2019 Report Share Posted December 29, 2019 I need a new fuse box cover made!!!! for my 521 Quote Link to comment
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