100 amp fuse removed by engine builder

[gkronberg]

Hello
My new rebuilt engine came with a box of left overs old bits, I saw a metal plate with a plastic like fuse holder and instantly I assumed the 100 amp fuse had been removed .
contacted the mechanic and yes , the fuse has been removed

1. what issues problems can result not having the 100amp
2. can I live with it like this ?

thoughts and suggestions

thanks

[Penelope Stopit]

If you mean a 100 Amp fuse that's fitted in the main alternator supply..........................

This is a sure sign that the engine builder knows the job inside out (electrics and all)

The 100 Amp fuse protects the main alternator positive from burning out if it goes down to earth somewhere. If the alternator supply cable is sleeved, clipped and run correctly, it isn't going to short out but should be checked at intervals. The only other problem that can short out the cable is if the alternator positive post insulator has been damaged by over-tightening or whatever. If an alternator rectifier plate diode went short circuit, the diode would melt rather than the cable overheating

Keep your eye on the cable.......100 Amp alternator fuses are for kids and cause no end of problems

[BIG DUNC]

Apart from TVRs, how many other cars have 100amp fuses or indeed any alternator fuse?

In over 30 years of playing with cars, I have never heard of an alternator fuse blowing, other than on a TVR.

I have never heard anyone say or post “the 100 amp fuse failed and it saved my car as there was a direct short”. I have heard and read countless stories about breakdowns and flat batteries due to the 100 amp fuse failing because it was old / dirty / cracked / whatever. But I have never heard of one failing due to an over current. They just seem to cause problems.

It is up to you whether you want to get it refitted, but I would be relaxed about it. My Griff was built before TVR started fitting them. When I rebuilt it, not for one second did I think about fitting a 100 amp alternator fuse as an additional safety Benifit.

[Zeb74]

BIG DUNC said:

Apart from TVRs, how many other cars have 100amp fuses or indeed any alternator fuse?

In over 30 years of playing with cars, I have never heard of an alternator fuse blowing, other than on a TVR.

I have never heard anyone say or post “the 100 amp fuse failed and it saved my car as there was a direct short”. I have heard and read countless stories about breakdowns and flat batteries due to the 100 amp fuse failing because it was old / dirty / cracked / whatever. But I have never heard of one failing due to an over current. They just seem to cause problems.

That makes sense, however, why would they have decided to put one? I don't want to say you're wrong, this is just a stupide question. Was it installed as a workaround of a conception error of some parts?

[Gloopy]

For what it's worth, the 100amp alternator fuse blew on a 2009 Hilux of mine in April this year whilst on the M5 at night. All lights failed and various warning lights came on. Truck kept running and got me home. Fault was a damaged alternator where corrosion had resulted in most of its outer casing going missing. There was not enough left of it to even be considered for a trade-in against a new alternator. I was concerned that other electrical systems had been damaged which would have proved very expensive. Turned out that the 100amp fuse blowing had prevented damage to anything else and all systems came back to life after a new alternator and fusebox were fitted. So, in my opinion a 100amp fuse is worthwhile but others may have a different view.

[gkronberg]

Thanks for the feedback

Mechanic and his electrician gave me a lecture on why it seemed illogical to have one , and based on their knowledge and history they saw it more as issue than a necessity.

Mmmm Spoke to Dom about this as well . He says fit one ..