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Old 06-02-2008, 06:31 PM
guba_unus's Avatar
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maxi fuse

Can someone explain maxi fuse's for me?

I just put in a cs-144 (140 amp) alternator. I plan to replace the 10 gauge alternator wire with at least an 8 gauge wire. I was thinking of replacing the old 14 ga fusible link with a maxi-fuse but I can't figure out what fuse it would need. Can someone recommend what size fuse I would use. It also seems the maxi fuse holders would best be mounted near the solenoid rather than the alternator, which would leave the wire from the alternator to near the solenoid unprotected. Any help is appreciated, I'll do my best to provide any additional information.

Thanks

As far as power draw from the truck, here is what I have
fuel pump
unilite ign.
elec fan
heater and a/c
power wipers
power windows
radio
lights

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Old 06-02-2008, 07:40 PM
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My fuesable link is a 30 Amp circuit breaker.....for the simple reason that it WILL blow at a dead short but I dont have to worry about having to keep fuses in the car.......because lord knows that I'd be out somewhere and not have any....

on a side note my chevette was blowing alts out quite a bit from the stereo equipment in it.

So I put a 50amp breaker in the line to the BAT and all was better.....I have sense removed the speakers and amps and I probly dont need it but its there on the off chance that something goes wrong.....however I dont know what might....
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Old 06-03-2008, 06:43 AM
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I know a 140 amp alternator will only put out 140 amps at peak and for a short time. But let's say it's sustaining 100 amps while riding down the highway (fans on/ a/c going, radio...) How will a 30 amp circuit breaker not pop? Same with a 50 amp maxi fuse?
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Old 06-03-2008, 09:49 AM
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true your alt may be putting OUT 100 Amps (100 amp on a old car is almost unheard of....stock is 60...MAX)

But fuses and circuit breakers look at the thermal LOAD on them.

Most of the time you are pulling (with no electric fan) 20 amps max.

A 14 gauge fusible link is designed to blow at 80% of a wires max amps of the same gauge. 14 gauge = 32 amps

Same with a circuit breaker they are designed to trip at 80% of their rating.
(however they mimic links better than fuses because they take longer to trip at that rating)

Fusible links are a fail safe for the cars electronics....so if bubba throws a .22 casing or *cringe* bullet in place of the radio fuse and theres a dead short....it blows the fusible link out and kills EVERYTHING

Now when installing high draw electronics to a older car you should ALWAYS wire them on a relay and run a NEW power wire DIRECTLY from the battery for their main draw. (don't forget the fuses!!)

Hope this spreads some light on the subject.
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Old 06-03-2008, 10:55 AM
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Read this about fusible links.
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