Ext to internal regulated alt wiring question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RainFade · 12-19-2005, 11:05 AM

OK I've got all the goodies for a serpentine conversion coming and have read the faq's and googled but have one silly question.
Can I use the gauge in my dash for the #1 wire from the new alt ?
I've seen it written up that you can wire to the idiot light or use a 35 -100 ohm 3 watt or larger resistor, then in another thread someone mentioned you could use the gauge in clusters so equipped.

My multimeter has decided to croak so unless santa brings me a new one I can't just measure the resistance of the gauge... and even then i'd feel better knowing others have used theirs successfully for extended periods.

I've got some 75 ohm 5 watt resistors but am unsure how well they'll hold up in an engine compartment even shrink tubed, tie wrapped and othewise protected.

**tnblazerk5** · 12-19-2005, 11:42 AM

go here and read
http://www.madelectrical.com/electri...hreewire.shtml

**truckdude239** · 12-19-2005, 02:15 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=119379 to wire the new alt i just switched to an int volt reg wonders it does

neonlarry · 12-19-2005, 04:43 PM

I'm guessing since you have a serp setup and are talking about wiring an idiot light or resistor to your alt that you have a CSxxx type alt? If so, no the gauge will not surfice replacing an idiot light or resistor. There needs to be enough resistance to cut the exciting voltage down to the alt to keep from frying the exciter circuit.

12-19-2005, 11:42 AM	#2
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	Re: Ext to internal regulated alt wiring question go here and read http://www.madelectrical.com/electri...hreewire.shtml

12-19-2005, 02:15 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Ext to internal regulated alt wiring question http://67-72chevytrucks.com/vboard/s...d.php?t=119379 to wire the new alt i just switched to an int volt reg wonders it does __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-19-2005, 04:43 PM	#4
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Re: Ext to internal regulated alt wiring question I'm guessing since you have a serp setup and are talking about wiring an idiot light or resistor to your alt that you have a CSxxx type alt? If so, no the gauge will not surfice replacing an idiot light or resistor. There needs to be enough resistance to cut the exciting voltage down to the alt to keep from frying the exciter circuit. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

12-19-2005, 11:05 AM	#1
RainFade Registered User Join Date: Nov 2004 Location: Central Ohio Posts: 215	Ext to internal regulated alt wiring question OK I've got all the goodies for a serpentine conversion coming and have read the faq's and googled but have one silly question. Can I use the gauge in my dash for the #1 wire from the new alt ? I've seen it written up that you can wire to the idiot light or use a 35 -100 ohm 3 watt or larger resistor, then in another thread someone mentioned you could use the gauge in clusters so equipped. My multimeter has decided to croak so unless santa brings me a new one I can't just measure the resistance of the gauge... and even then i'd feel better knowing others have used theirs successfully for extended periods. I've got some 75 ohm 5 watt resistors but am unsure how well they'll hold up in an engine compartment even shrink tubed, tie wrapped and othewise protected. __________________ 71 K20 350/350/205, dealer air, 4" lift, Flowtech,Edel 1406 on 2101, procomp HEI,4.10's, 33x12.50x16.5 BFG MT's on slots. 4 wheel disc brakes. My lame K20 page My lame Eaton disc brake page



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