Alternator Q's - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tom · 05-23-2005, 03:52 AM

Stock for a 1/2ton truck alternator wise is 63 amp. This style amp can also be bought stock in 78 and 91amp versions. I found out about the 78amp one a couple years ago and bought it as I had a large sterio. Well, I only bought the 3yr warrenty and its going out. Lucky for me, I work where I bought it [checkers] and get 25% off. Also found a lifetime warrenty 91amp for only $10 more. So for $10 I get 13amps more and lifetime warrenty. Sweet. But now I don't have the sterio, and won't for a few months. Will running a monster alternator without the need have any adverse affect on it?

Justins76 · 05-23-2005, 04:55 AM

It'll be fine. The alt will only put out as much amps as needed.

hotrodhomi · 05-23-2005, 09:42 AM

yah, what he said^

PHOENIX · 05-23-2005, 01:57 PM

Tom, I've had that Checker alternator for a couple years now.
Only complaint is I wish it had more amps at idle.
With headlights, electric fan and sterio on I get some dimming.
While driving 2500 rpm I still get a little light dimming, but not too bad.
When I get around to it ($$$) Ill upgrade to a Powermaster (37294) 140 amp,
it produces 80 amps at idle (800 rpm).

Hoods69BadBowTie · 05-23-2005, 01:57 PM

It should not hurt anything.

bodydropped · 05-23-2005, 02:32 PM

i can get one modied for 180 and it puts out 280 amp and 100 at idle

Tom · 05-23-2005, 05:00 PM

LOL I think 90amp will be plenty for me, no electric fans here. Just an engine, and later on a sterio. Never had any problems at all with the 78amp versions, I just want MORE POWER

Justins76 · 06-05-2005, 03:20 AM

Do you have the part number for the 91 amp unit? Thanks

piecesparts · 06-05-2005, 12:03 PM

When I put electric fans on my truck along with the stereo that I am running I needed more power. To solve this I went to a company called Tuff Stuff ( http://www.tuffstuffperformance.com/ ) and got an alternator that carries 80 amps at idle and 140 amps above 1500 RPM. This solved my problems for 3 years now.

05-23-2005, 03:52 AM	#1
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Alternator Q's Stock for a 1/2ton truck alternator wise is 63 amp. This style amp can also be bought stock in 78 and 91amp versions. I found out about the 78amp one a couple years ago and bought it as I had a large sterio. Well, I only bought the 3yr warrenty and its going out. Lucky for me, I work where I bought it [checkers] and get 25% off. Also found a lifetime warrenty 91amp for only $10 more. So for $10 I get 13amps more and lifetime warrenty. Sweet. But now I don't have the sterio, and won't for a few months. Will running a monster alternator without the need have any adverse affect on it? __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

05-23-2005, 04:55 AM	#2
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	It'll be fine. The alt will only put out as much amps as needed. __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

05-23-2005, 01:57 PM	#4
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Tom, I've had that Checker alternator for a couple years now. Only complaint is I wish it had more amps at idle. With headlights, electric fan and sterio on I get some dimming. While driving 2500 rpm I still get a little light dimming, but not too bad. When I get around to it ($$$) Ill upgrade to a Powermaster (37294) 140 amp, it produces 80 amps at idle (800 rpm). __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

05-23-2005, 01:57 PM	#5
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	It should not hurt anything. __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

05-23-2005, 02:32 PM	#6
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	i can get one modied for 180 and it puts out 280 amp and 100 at idle __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-23-2005, 09:42 AM	#3
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	yah, what he said^

05-23-2005, 05:00 PM	#7
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	LOL I think 90amp will be plenty for me, no electric fans here. Just an engine, and later on a sterio. Never had any problems at all with the 78amp versions, I just want MORE POWER __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

06-05-2005, 03:20 AM	#8
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	Do you have the part number for the 91 amp unit? Thanks __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

06-05-2005, 12:03 PM	#9
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	When I put electric fans on my truck along with the stereo that I am running I needed more power. To solve this I went to a company called Tuff Stuff ( http://www.tuffstuffperformance.com/ ) and got an alternator that carries 80 amps at idle and 140 amps above 1500 RPM. This solved my problems for 3 years now.

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