Why No Fuse Protection? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1-PU70 · 03-06-2005, 01:32 PM

I know there is a fusibale link for the main power supply from the battery but why is there no fuse protection from the main charge wire from the alternator?

Longhorn Man · 03-06-2005, 01:51 PM

So they can sell more altenators?

dwaite72lnghrn · 03-06-2005, 02:33 PM

Just guessing but are you trying to protect the alternator or the Harness? The alternator has 12v (16 guage white&dark blue) going to the field windings(about 18 gauge solid) as well as the output(12 guage red). to protect the alt. you would have to fuse both, The diode bridge in the circuit just before the output wire will keep voltage from going backwards into the alt. unless that is what shorted then OOPs you have to replace it anyway.
Fuses that are in high current protection don't like vibration, They have a tendance to go open when they heatup so you won't find them there to often.
If the alt. does short the fusible link(16 guage ) goes, voltage goes, no burnt wire harness. That is why never replace your wires with some thing other than what was there originally.

03-06-2005, 01:32 PM	#1
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Why No Fuse Protection? I know there is a fusibale link for the main power supply from the battery but why is there no fuse protection from the main charge wire from the alternator? __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

03-06-2005, 02:33 PM	#3
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Just guessing but are you trying to protect the alternator or the Harness? The alternator has 12v (16 guage white&dark blue) going to the field windings(about 18 gauge solid) as well as the output(12 guage red). to protect the alt. you would have to fuse both, The diode bridge in the circuit just before the output wire will keep voltage from going backwards into the alt. unless that is what shorted then OOPs you have to replace it anyway. Fuses that are in high current protection don't like vibration, They have a tendance to go open when they heatup so you won't find them there to often. If the alt. does short the fusible link(16 guage ) goes, voltage goes, no burnt wire harness. That is why never replace your wires with some thing other than what was there originally. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

03-06-2005, 01:51 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	So they can sell more altenators?



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