Re: In-Line Fuse

Posted by John T on May 12, 2009 at 06:47:28 from (66.244.97.31):

In Reply to: In-Line Fuse posted by Johnny Lawson on May 12, 2009 at 05:10:54:

You obviously cant use a fuze in the heavy cable starting motor circuit but if your little heart desires, sure you can use others in the low amperage circuits.

To protect the wiring that feeds hot batetry voltage OUT of the battery to low amperage tractor loads, Id fuze it at or near its source which may be where the big battery cable attaches to a starter switch. (A wire from there up to ammeters Supply terminal feeds loads like lights n ignition via the series ammeter PLUS carries charging current back into the battery also via the ammeter) The fuze would go right there (at switch where big cable attaches) that way the wiring from there up to the ammeter etc is protected.

The fuze is sized to protect the wiring (its ampacity), so if youre using say 10 gauge wire from the starter switch up to the ammeter I'd use a 30 amp fuze.

BUT NOTE if the alternator can produce say 50 amps, that wire were talking about above (from starter switch to ammeters Supply terminal and from ammeters Load terminal to alternators output) should by rights have the ampacity to carry such amperage
WHICH MEANS YOU SHOULD USE BIGGER WIRE (maybe 10 or 8 gauge depending on alternator) BOTH from alternator to ammeter and from ammeter to starter switch AND THAT ALSO MEANS YOU NEED A BIGGER FUZE SAY 40 OR 50 AMPS !!!!!!!!!!!

NOTE theres also an issue in that if the alternators sensing voltage wiring circuitry becomes open, the alternator may overcharge so one needs to use caution when and where an alternator (at least it voltage sensing circuitry) is fuzed !!!!!!!!!!!!!!!!!!!!!!!!!

ALSO if you are really concerned you could place a 15 or 20 amp fuze (depending on if you use 12 or 14 gauge hook up lighting n ignition wiring) at the ammeters Load terminal and out of it feed the lights and ignition.

Soooooooooo I would at least use a fuze at the ammeters Load terminal output (say 15 or 20 amp depending on 12 or 14 gauge wiring) to protect the wiring to Lights and Ignition etc.......

BUTTTTTTTT if you wanna try to fuze n protect the alternators charging circuit, i.e. from alternator to ammeter and from ammeter to big battery cable at starter switch, youre talking bigger wire (8 or 10 gauge) which requires a bigger fuze (40 or 50 maps etc depending on alternator used) and a matching 40 or 50 amp fuze.

If it were me Id just fuze n protect the ammeters Load side circuitry (to lights n ignition) with a 15 or 20 amp fuze right on the ammeters Load terminal,,,,,,,,,,Id use 8 or 10 gauge wiring from alternator to ammeters Load terminal and from ammeters Supply terminal to the battery via the starter switch conenction,,,,,,,,,,,not sure I would fuze the charging circuitry (alternator to ammeter n ammeter to starter switch) unless wired such that the voltage sensing circuit cant get open (due to a blown fuze) and allow the alternator to overcharge ??????????????????/

I SURE LOOK FORWARD TO HOW MY SPARKY FRIENDS BOB M AND JIM WOULD FUZE AN ALTERNATOR !!!!!!!!!!!

John T (NOT any alternator expert, more a generator guy)

Replies:

• Re: In-Line Fuse Janicholson 21:17:32 05/12/09 (0)

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