I got it one piece at a time........

[captain720]

What is the amperage of the black fusible link that goes to the alternator supposed to be? Mine has a 15 amp fuse instead of a link. There is the small signal wire and the bigger one off the back of the T Plug, currently both are running through their own 15 amp fuses

[datzenmike]

Ha ha a lot more than 15 amps...

 

 

This is from Nissan. Looks like Black is 80 amps. I only have the '84 FSM and assume the '85 is similar. On the '84 the Black fusible links has to safely pass enough current for 2 X 10 amp, 2 X 15 amp and one 20 amp fuse. 

[captain720]

Oh wow so it needs to be like 80 amps that's why the 15 keeps blowing ....... I am amazed that the 15 amp worked fine for a year

[datzenmike]

Youll have to check the '85 but the '84 shows...

 

tail, marker, license, interior light 15 amp

stop and hazard lights, 15 amp

horn, chime, 10 amp

heater blower, 20 amp

clock/ inspection lamp, 10 amp

 

That's 70 amps though unlikely all these draw that amount. 80 amp is a margin for error. Fuse ratings are only to protect the wires. Also unlikely the heater would be on blast, brakes/4 ways, interior lamp on and honking the horn. lol

[captain720]

I ran all my fog lights, heater on blast, turn signals, brake lights, and headlights and that's what it took to pull 15 amps through the alternator charge wire and pop the too small fuse so they clearly have a lot of overhead. I don't have a radio that could be a big factor 

[captain720]

Turns out..... The big chrage wire isn't the problem for some reason the small little signal wire is blowing fuses only in startup. That wire is going to battery power on a 15 amp fuse

[captain720]

Where do you buy such big fusible links? No auto parts house in my town can even order an 80 amp fusible link

[datzenmike]

 

80 amp is 1.25mm square.

 

 

Here's one for a 1.0square mm. A little undersize but better than over size.

 

https://www.google.ca/search?q=80+amp+fusible+link+wire&sxsrf=AOaemvI7lw_-nV1vRE3xiOwYd-UDsJItEQ:1635477919302&source=lnms&tbm=shop&sa=X&ved=2ahUKEwiJtquD1u7zAhVQrJ4KHcDzBt4Q_AUoAXoECAEQAw&biw=1600&bih=738&dpr=1.2#spd=14356638355583986111

 

 

You only need about 4". An 80 amp fuse will work but a fusible link is preferable because it can sustain a shot term maximum load without blowing. Perhaps 4-5 seconds before melting, where a fuse blows instantly.

[captain720]

Alright I'll look into ordering something, I switched to a auto resetting breaker because I did not want to go without wheels while I wait for fusible link to ship

[captain720]

I got my gas door to stay latched thanks to a suggestion from someone who comments on my videos.

 

 

[captain720]

Installed a new light bar on the 720, working realy well so far.