What ratings for a hj47 fusible link

[chappohj47]

What ratings for hj47 fusible link
On a hj47 what are the amp ratings for a fusible link I think they have three or four wires what are the ratings for
Power

Dash
And so on cheers chappo

 

[bj40green]

I want to make a statement here, so that people who read this don't get the idea that they can replace a fusible link with an in line fuse without knowing the consequences.

1. A Fusible Link is not a fuse. It's a LINK that burns at a certain current after a certain time and is there to protect the Harness from overload damage.
2. A Fusible Link is not rated in Amps.
3. A Fusible Link is rated in wire size AWGxx.

Having said this.....

Here is my advice:
Put in a 50Amp fuse. Rev up the engine, switch on all the electrical stuff you have and honk the horn. If the fuse blows go one step higher, repeat test and so on.

Good luck,

Rudi

 

[chappohj47]

Just to let everyone know I am replacing the fusible link with maxi fuses and the are made for the job they are in new cars instead of fusible links

 

[lostmarbles]

I think the main fusible link is under the most load when the battery is dead flat and the engine is revved up (as would happen after using jumper leads to start a cruiser that's been left unused for a long period).

And I think the other "high load" occasion is "engine off" plus "all lights, wipers, heater fan, brake lights, etc etc operational".

 

[bj40green]

He has a 3 in 1 Fusible link (missing?). I think it looks like this:


One (blue 2.0 mm²) for the glow relay and starter relay
One (purple 0.3 mm²) for the EDIC
One (black 1.25 mm²) for all the other stuff

And maybe a 4th (green 0.5 mm²) if he has the "evil" tap.
All diferent ratings. Nice puzzle.

Rudi

 

[chappohj47]

What is an evil tap

 

[bj40green]

What is an evil tap

The "evil tap" is a 12V tap from the center of the two batteries.
In some 24V (Canadian) Cruisers this tap is used for 2 x 12V headlights.
Some / a lot of people use this to hook up radio/CD/GPS/you name it.

The problem is that both batteries are not equally discharged so they have a different life span.

Rudi

 

[chappohj47]

Thank you for the explanation cheers chappo

 

[superdupercoope]

Hoping someone can help us!
Super mystery!

We have an 81 hj47, 12v from Australia (used to be an emergency response). While driving we started smelling burning and then the rig went completely dead. We found that the Preheating Timer (pn 28521-68030) was what burnt up. Not sure what caused it.

Months ago our alternator died so we had it rebuilt but it wasn't charging the battery. Read on the forum that they usually kill the voltage regulator too. Then we found out that we don't have the normal regulator and instead have 2 Bosch units. I assumed each was for the dual battery setup we had so I switched the wires to see if one of the regulators was still good.

Back to present, I assumed my switching of the wires was the culprit so I switched them back.

The truck wouldn't key on anything so I found a little fuse box near the battery with one burnt out (5A). I'm assuming it's the fusible link replacement? We replaced it and the truck would key on but when we tried to turn it over the fuse blew.

I tried this with the burnt out timer connected and disconnected, both blew that fuse.

Besides the obvious timer being fried, why would the fuse blow if the timer isn't even connected?

Appreciate anyone's help. I'm. A newb still trying to learn the ins and put on this and am learning by trial by fire. Sigh.