Notices
1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
Sponsored by:
Sponsored by: Moser

Dual Alternator Setup?

Thread Tools
 
Search this Thread
 
Old Jun 12, 2012 | 07:45 PM
  #1  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Dual Alternator Setup?

Anyone ever seen this done on a 302. I don't plan on going TOO crazy with my '76 F100, but there are certain things that I would like to power in my cab and I want to make sure I can power a decent audio system (not slammin' bass or anything) as well as power windows, locks and... if I go completely insane... seats.

I know there's the 3G upgrade and it gets up to 130 amps, but I'm not sure if that's going to be enough. I'm not very good with electrical knowledge. Someone else will be doing all of that for me.
 
Reply
Old Jun 12, 2012 | 09:11 PM
  #2  
Blue and White's Avatar
Blue and White
Postmaster
Joined: Nov 2011
Posts: 2,553
Likes: 10
Anything is possible... but its a can of worms as the saying goes. Mounting, belt routing, belt loading (overloading?) and voltage regulation come to mind. The G3 is (I understand) 130 amps. There is a straight bolt in Powermaster at 140 amps (Summit). I believe either of these would power all accessories including a pretty stout amplifier. Suggest you add up your loads (amps) and double check... there is likley a simple single alternator solution.
 
Reply
Old Jun 12, 2012 | 09:13 PM
  #3  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
140 amps you say? Hmmm.

I'm pretty sure I can do everything I need to with 130 amps, I just wanted to know if the dual setup is worth the trouble if it comes down to it.
 
Reply
Old Jun 12, 2012 | 09:30 PM
  #4  
HIO Silver's Avatar
HIO Silver
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
If ya get all excited over an extra 10 amps, then you'll have a truckgasm with a 200-amp 3g alternator: Ford 3G High Amp Alternators, Ford High Output Alternators, Nations Starter & Alternator

IMO, it's not worth going to two alternators. Do the 3G retrofit and go with dual batteries.
 
Reply
Old Jun 12, 2012 | 09:33 PM
  #5  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Do you think the 200 amp alternator would have any problems fitting on the 302?
 
Reply
Old Jun 12, 2012 | 10:04 PM
  #6  
Bullitt390's Avatar
Bullitt390
Certified Thread Hijacker
20 Year Member
Photogenic
Liked
Joined: Aug 2001
Posts: 14,441
Likes: 60
Club FTE Silver Member

Originally Posted by Herr Geist
Do you think the 200 amp alternator would have any problems fitting on the 302?
It isn't like the 200 amp 3G is actually 53% bigger... same size as a 130 amp 3G which isn't much bigger than the POS 1G

Josh
 
Reply
Old Jun 12, 2012 | 10:36 PM
  #7  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Right, but I believe I read somewhere that there needs to be some room made for the 130 amp 3G and I'm not exactly sure where I read it or what was needed to make it fit.
 
Reply

Trending Topics

Old Jun 12, 2012 | 10:52 PM
  #8  
Bullitt390's Avatar
Bullitt390
Certified Thread Hijacker
20 Year Member
Photogenic
Liked
Joined: Aug 2001
Posts: 14,441
Likes: 60
Club FTE Silver Member

You might have to re-clock the 3G case to get the terminals in a better position (the 3G case is slightly deeper), but the actual case isn't much larger than the 1G.

Josh
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Jun 12, 2012 | 11:15 PM
  #9  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Well, I figure if I can pick up a brand new one, re-clocking shouldn't be a problem since I won't be fighting corrosion and such. This sounds like the best bet.
 
Reply
Old Jun 12, 2012 | 11:15 PM
  #10  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Thanks for the information.
 
Reply
Old Jun 12, 2012 | 11:21 PM
  #11  
Bullitt390's Avatar
Bullitt390
Certified Thread Hijacker
20 Year Member
Photogenic
Liked
Joined: Aug 2001
Posts: 14,441
Likes: 60
Club FTE Silver Member

Snag one from the junkyard for like $20 versus $175+ for a reman. I have come across several that were easily less than a month old before the car was scrapped.

Josh
 
Reply
Old Jun 13, 2012 | 12:01 AM
  #12  
Herr Geist's Avatar
Herr Geist
Thread Starter
|
Junior User
Joined: Jun 2012
Posts: 82
Likes: 0
Nice. Junkyards it is.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Nytefog
6.7L Power Stroke Diesel
8
Apr 25, 2015 08:20 PM
RPM371
6.0L Power Stroke Diesel
24
Feb 26, 2014 06:08 PM
G79cX8
1968-Present E-Series Van/Cutaway/Chassis
8
Jan 1, 2011 09:55 AM
pminne
1999 - 2003 7.3L Power Stroke Diesel
20
Nov 11, 2009 05:58 PM
lsrjf
1967 - 1972 F-100 & Larger F-Series Trucks
4
Jul 20, 2003 03:01 AM




All times are GMT -5. The time now is 01:46 PM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE