TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. > Project Classic Motobricks

Quick fix, circuit breaker, save your brick from burning.

(1/10) > >>

Today I installed a circuit breaker.

Because these bricks will be pushing forty years old before we know it, and these wiring looms aren't as pliable as when new, its worth considering the protection of a circuit breaker. I chose the manual disconnect type, so it doubles as an immobilizer, but I will state straight up that the market for stolen bricks wouldn't be much greater than the market for stolen mortar. It could also be used like a battery isolator, in a limited sense.

Step 1. I bolted the circuit breaker to the top of the coil cover.

Step 2. Removed the fuel injection relay positive from the positive of the battery (the thinnest of the three red wires to the battery positive)  and connected it to the breaker aux. terminal. I cheated by cutting one inch of the loom sheath from the end opposite the battery, to free it from the alternator loom sheath. A bit of WD40 also helped in sliding it out.

Step 3. Snipped the red ignition switch (combined) wire to the starter relay at the relay positive terminal (the thinner of the two) and crimped a connector on to connect it to the breaker aux. terminal.

Step 4. Ran a new wire from the battery positive to the breaker battery terminal.

If I did it again, I would reinstall the accessory socket a little further back, making it easier to press the switch.

Attempt 2 at adding a photo

Thanks for the How-To. Do you suggest a particular type and amperage rating for the breaker? Beats the heck out of having the brick burn down the garage.


I used a 40 Amp, it was cheap and close by. I thought it would show in the photo, unfortunately the focus is bad, but it was the best of about ten photos I took.

I put a battery disconnect on mine, mainly in case the starter relay ever fused shut


[0] Message Index

[#] Next page

Go to full version