Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) What Did You Do To Your Morgan Today?

Good luck with that sewin. Remember there will be four additional connection points when adding a fuse to a starter motor main feed. The two fuse holder terminals plus the two points of contact with fuse itself will each have a minute ohmic resistance but they add up and the high starter current will greatly magnify the ensuing volt drop mitigating voltage at starter. You can then add reliability of connections which long term could cause further higher resistance given a likely exposed location. Then you have to decide what fuse current and type to use in order to give some protection whilst providing starting reliability. There are many variables here particularly allowances for cold weather. Using a mechanical circuit breaker will lower reliability even further given the probability of false trips.

The industry standard of well engineered cable runs and heavy current cable insulation gives an incredibly low likelihood of failure or short. This and above probably explains why virtually every vehicle on the road has a direct heavy current cable from battery to starter motor (battery isolators aside) just as our Morgan's. It's certainly not about saving money.