Datsun 521 fuse box question

[datson4life]

the 1st fuse keeps blowing, the farthest one on the left, and my voltage drops and my gas guage goes out, its the stock fuse box to the 521

 

what fuse is that for?

[MikeRL411]

Do you have the cover for the fuse block?  The units served are printed on the paper lable glued to the cover.

[datson4life]

yea its hard to read but i figurerd it out, its for meter/reverse/and blinkers

[datson4life]

i dont wanna miss the datsloco meet, how long can i run a fully charged battery without alternator helping?

 

im 25 minutes away from the show

[banzai510(hainz)]

How much is a tow truck back to your house?

[datson4life]

well im taking an extra battery, how are my chances? ive heard ppl getting up to 80 miles on just the battery

[datson4life]

i didnt mke it to the meet, i got quite a few wires from the fuse box going straight to ground, and my battery spilled quite a bit of acid and gave up the ghost :confused:

[banzai510(hainz)]

told ya

Better clean that acid before it eats the paint.

 

 

no way few wires can be to ground.

[datson4life]

i didnt drive it to meet, i didnt wanna risk it

 

but i got a few wires in the fuse box that are going straight to ground, everything looks good thom, i tested the alt,starter, ignition etc, looks like i have issues in the harness, some of the visible wires did melt or get pretty hot

[banzai510(hainz)]

you might have to remove the tape to get a better picture whats going on.

[datson4life]

does anybody have wiring diagram of voltage regulator? 

im about to run some wires straight and bypass the lines going from fuse box straight to ground

[DanielC]

No wires should go from the fusebox to ground, without going through something else first.

 

This is probably more than you need, or maybe not.

[datson4life]

got it started, looks like a relay or the flaser was touching the back of my cluster (hopefully thats what it was)

 

but i dont undestand why still some fuse box wires are going straight to ground, yet when i start the truck and give them all juice no fuses pop and gives me good voltage,, and eveything seems to be working fine  :confused:  :confused: :confused:  :confused:  :confused:  :confused:  :confused:  :confused:  

 

with no juice fuse box wires go straight to ground, but with juice they work normal :confused:  :confused: :confused:  :confused:  :confused:  :confused:  :confused:  :confused:  :confused:  :confused:   

[banzai510(hainz)]

go back to post #8 what I said.

 

It works your getting somewhere

[datson4life]

so everything is working great, good charge, then 20 mins into the drive my charging system goes out, no blown fuses this time, i beleive its my alt jacking up, i unplug battery and truck turns off, and theres a dual plug that goes into alt, no voltage coming out from the on alt on that plug, someone please tell my that my alternator is bad and my trouble is over,

 

oh and ignition light came on as truck is on, it usually turns off when truck starts

[racerx]

take alternator and get it check to autozone or oreiley. good. lluck

[DanielC]

From Nissan service manual, Alternator test.

[banzai510(hainz)]

Ratsun owners really need to get a Volt meter or this volt meter. Its simple and works very well You can see whats happening way before the idiot light comes on. By the time the IGNITION light is on its too late.

I only think this is worth 10$ but it works good. plug in Cig lighter and dont drain the battery.

http://equus.com/Product/3721/Battery-Monitor

 

PS early 521 might hqve a funky plug hook up for the alternator.  When you request a ALt make sure its able to plug in your harness.

Later 521s use the typical T connector like a 510.

If you need a spec typ alternator try a rebuild shop to fix it.

 

 

also if you shut your truck off and it still runs. it could be the volt reg.

[datson4life]

i have a voltage guage, my battery is fine, i just got it the day before, im only getting 12 volts when truck is on..............i will get alternator tested today or tomorrow,

 

there is nothing coming out of the t plug

the issue started when i accidentaly connected the alt positive and negative together when i was putting truck back together

yes i do stupid things when im in a hurry

[banzai510(hainz)]

I would ck the fuse box area.

 

if you connected the + and neg wire and not touched the alternator then it couldnt be the alternator unless you touched it at the + post and mayeb fryed a diode.

 

 

fisrst off:

the issue started when i accidentaly connected the alt positive and negative together when i was putting truck back together

 

yes i do stupid things when im in a hurry

 

 

should have said this first as I think half of these proplems are Owners induced.

[datson4life]

the 2 switched fuses are going straight to ground again, alternator tested positive, now ill start to inspect harness (which was not in good condition)

heres a picture of the inconvenience of wire tucking

[banzai510(hainz)]

man that looks like proplems waiting to happen.

what you going to do when it rains and corroedes all those connections. 521s have a bad time already on this even under the hood

[DanielC]

This would never work in Oregon, at least west of the Cascades.

 

Is this the truck that is having the wires shorting to ground problem?    It may be "cool" to have the wires hidden like that, but I would keep your bicycle handy, to have reliable transportation.

 

Where is your fuse box?  Is it moved into the cab, behind the glove box?  is there a possibility the wiper linkage is hitting some wires?  Did somebody do a lot of splicing of wires to move components around?

[banzai510(hainz)]

nightmare waiting to happen

got to pull the fender all the time.

[datson4life]

we dont get that much rain in modesto and i hardly drive it

i tried to cover up the most i can, i wrapped the wires, then put wire wrap flexible stuff, then wrapped again in tape

the fuse box is in its original place, just moved a couple inches over

i did splice a few wire