5.0 alternator
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Junior User
Joined: Jan 2013
Posts: 87
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5.0 alternator
I want to know what the stock out put of a 5.0 alternator is. I put two KC lights on my roll bar and my buddy says it won't be enough even with the truck running. They are each 100w lights so it's 200w total. Can the stock alternator handle it if it's in decent condition.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
He could already have a large case 3G alternator, look at the face with the pulley, if it has 3 groups of 4 holes (at 120° of each other) then it's a small case 95A 3G, if there are 2 holes in the same arrange, then it's a large case 130A 3G... Good luck!.
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Cross-Country
Joined: Apr 2013
Posts: 56
Likes: 0
From: Hawthorne, NJ
Here is a excellent reference and explanation page I used when upgrading my 2G alternator on my 90 Bronco. May have to do the same to my new 1992 F150.
Fuel Injection Technical Library » 3G Install Tech
I purchase a 130 amp 3G form the following site
RJM Injection Tech — Alternators
These are 100% new alternators not rebuilds. When I did my upgrade I also bought the 3G alternator harness needed to convert 2G to 3 G and an Alternator Charge Cable Kit. The instructions were included and easy to follow. I run a plow on my Bronco and this higher output alternator was a must upgrade.
RJM Injection Tech — Alternator Charge Cable Kit
RJM Injection Tech — 3G Alternator Harness
Hope this helps... thanks
Fuel Injection Technical Library » 3G Install Tech
I purchase a 130 amp 3G form the following site
RJM Injection Tech — Alternators
These are 100% new alternators not rebuilds. When I did my upgrade I also bought the 3G alternator harness needed to convert 2G to 3 G and an Alternator Charge Cable Kit. The instructions were included and easy to follow. I run a plow on my Bronco and this higher output alternator was a must upgrade.
RJM Injection Tech — Alternator Charge Cable Kit
RJM Injection Tech — 3G Alternator Harness
Hope this helps... thanks
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Laughing Gas
Joined: Dec 2007
Posts: 959
Likes: 8
From: Imperial, MO
FWIW, the 95-amp 3G on a '95 5.0L won't have trouble with the extra draw of two 100W lights (which is between 14-16 amps at 12-14V; P/V=I). I've run a pair of 100W lights on my '95 5.0L for at least five years now without issue.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
95 amps at 14 volts is 1300 Watts.
25-100 Watts for the Radio (unless you have subs). 110 Watts for factory headlights. 150 watts for the computer and fuel pump. Maybe another 200-300 for the heater fan?
You have plenty of headroom to run a few lights.
25-100 Watts for the Radio (unless you have subs). 110 Watts for factory headlights. 150 watts for the computer and fuel pump. Maybe another 200-300 for the heater fan?
You have plenty of headroom to run a few lights.