Does anyone know the amperage, or wire size, on the fusible wire in this schematic?

It is for the starter circuit between the relay (50) and solenoid (51) on a 77 FXE.

 

Waiting for a answer and keeping you on top..

I see #2 copper or apx 1/4 for 180 amp. Sounds way to big.That's got to be wrong.

 

Here's a link that may be of some help or interest. https://www.wiringdepot.com/jt-t-tec...Link-Wire-FAQs. Maybe you could use the 1978 wiring and just add the 30 amp main breaker instead of the fusible wire.

 

Think we are talking and dealing with the starter amperage for the motor. Not the solenoid coil.

Am I wrong?

 

Sure looks like it to me...and I have Never used Fusible Link Wire in that Location...

 

I do not have access to my manuals. I don't ever recall a fuse of any type on the positive to the starter for the full load. Sure not a breaker on old stuff. If it's just the load on the solenoid, that is not very much.

Got my son to pull my manual. He says that's the solenoid. 51 is the start button/starter relay/key. Doesn't see an amperage for it, however. Just guessing but 30 is probably good as long as it's smaller than the harness wiring. I would probably just soldier in a small in-line plastic case for a replaceable BUSS fuse.

 

Kind of an interesting story. I installed the electric start 40 years ago from an FXE to an FX. When I originally did the job, I did not have, nor include, the fusible wire. Just before Christmas I went out to give the old girl a whirl and when I hit the starter button there was smoke, a melted wire.

I discovered the 14 gauge wire I used in place of the fusible link between the relay and solenoid came apart and shorted against the frame.

The stock wiring for this set up is a direct + from the battery to the relay, solenoid, and start switch (the small red wire in the photo).

This is actually a pretty serious circuit since it carries 12 v direct from battery all the time.

According to the link on fusible wire posted above, the fusible link should be 4 sizes smaller than the wire used. Since I'm using 16 gauge wire, the fusible link should be 20 gauge. 20 is rated at 11 amps. So, I'm going to go that route and put in a 10 amp fuse.

Keep my fingers crossed.


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