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.

 

If your truck has a 3G alternator, the stock one is probably 95 amp. With all the other things like AC, radio, and so on its barely adequate with no add ons. A 130 amp is a simple upgrade.

 

Ok. I don't know what alternator is on it and I never use the ac. How much work is putting on the 130 amp. Would I need new wires or can I just bolt it up.

 

What year is your truck?

 

It's a 95 f150 xlt with a 5.0

 

Your truck has a 3G alternator. Upgrading to the 130 amp is as simple as replacing it with one for an F250 diesel.

 

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!.

 

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

 

Ok thanks. I'll look at it and let y'all know what I find.

 

if it has the 95 amp, you might as well just get the 160 amp one from rjm

 

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.

 

Ok well there's other lights and stuff goin omit later so I don't know. Might just wait till this one shot then go up.

 

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.

 

Did you ever check what I told you? if you have a 130A 3G you have absolutely no need to replace it.

 

Yeah just got around to it tonight. It has a sectioned off peice 120 degrees from each other with two holes. So that would be a 130A right?