NOT A GOOD IDEA AND HERE'S WHY...
Car and truck manufacturer's never fuse this wire. Between the battery and starter motor should be sacred -- no breakers no fuses. Too much danger of the protection device itself faulting unnecessarily and placing you in danger. Example is easy to come by...
YESTERDAY YESTERDAY YESTERDAY!! In traffic, my friend punched the throttle to clear incredibly dense traffic in the outboard lane only to have to jam on the brake as an idiot accelerated forward to try and cut him off. The engine quit, he restarted it pulled into the bank parking lot where I went to an ATM.
Try to leave there was nothing but a click. Both of us are/were professional mechanics.
Diagnostics lasting a full minute revealed the starter motor internals were absolutely shorted. "There is smoke coming from the starter motor and the cable is very hot".
I can guarantee no properly sized fuse would have restarted that car in traffic.
CAVEAT! Let's skip the "How, If, But, Where, Why, Arguments and go for the Jugular".
Have you ever measured extreme cold weather current to a starter motor?
A motor that consumes say 150 amps at 70F can easily demand 275 amps in cold weather. Due to engine oil viscosity resistance. Connect THREE batteries in parallel and the engine can still crank slowly demanding lots of additional amps. I used to use an eight plus a six volt battery to jump start in horridly cold weather. Amperage was insane but the car started.
How do you fuse for this? You don't.
Instead of wasting money adding an item that itself causes the odds to rise against you, protect that wire...
NYLON SPIRAL WRAP available online not only reduces but utterly stops the chances of a starter lead cable from shorting via abrasion or a cut.
This is the split convoluted split tubing (which is virtually worthless for abrasion resistance). Spiral wrap is just that. It has to be spiraled onto the cable. Measure the OD of your battery to starter cable. Choose one size smaller spiral wrap.
How tough is this stuff? Use a sample length of cable. Then wrap it with nylon spiral wrap.
Now take a sharp HATCHET. And whack the stuffing out of the protected cable. SURPRISE! Many whacks of a 10 lb wood splitting maul is needed to breach the nylon spiral wrap. The resilience of cable within the spiral wrap is incredible.
This is the system I used on commercial fishing trawlers to protect 24 and 32 volt starter cables that were 20' in length. And then proper size nylon spiral wrap went over the alternator power cable.
Do it once and do it right IMHO
