alternator swap

alternator swap

dayriesw

Jeeper
Posts
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Location
Louisiana
Vehicle(s)
85 CJ-7
4.2L 258 w/weber
T-5
D300 twin sticked
D30/AMC20 both locked, 4.10 gears, one piece axles in rear
I am new to this forum.

I have the 4.2L 258 in my CJ. After the recent contour fan swap, I noticed that I cant stay above 12 volts (on the guage) at idle witht the fans on.

What are my options for bigger alternators? And do you have pictures?

thanks for the help
 
Hello dayriesw and welcome to the site! :chug:

Just about any high amp GM alternator is a popular swap for a CJ. The CS seriers being one of the better choices. You will have to change a small amount of wiring, unless you go with a "one" wire install. The draw back with those alternators is that they don't start charging until you "excite" the alt (rev the engine).
 
The CS144 GM is a pretty easy swap. you need to stretch the mount about 5/8 of an inch and re drill holes. If you have access to welder it is a walk in the park.
before
after
in place, more or less
The Cs 144 is a 140 amp alternator so you will also need a larger wire run to your battery.
I got mine from Rush Power systems with a non avalanche rectifier, a remote voltage regulator and a life time warranty.:cool:
 
Last edited:
I did the same as above only I pulled mine and misc parts from a caddy in the junk yard, LOL.
Also I didn't modify the stock mount I just used a universal chevy alternator bracket cut
down a little to make my mount and got a new belt.

Check out this link on how to wire the fan first then check the alt threads below:
http://www.jeepforum.com/forum/f8/electric-fan-diagrams-other-stuff-554309/
http://www.jeepforum.com/forum/f13/ford-taurus-two-speed-e-fan-install-pics-233676/
http://www.jeepsunlimited.com/forums/showthread.php?t=447933&highlight=Taurus+fan+upgrade

Links:
Good diagrams on wiring it here:
http://www.jeepforum.com/forum/f8/loss-about-my-charging-system-683164/
One wire alt:
http://mightymo.org/Proj_OneWire.html
Misc alt info:
http://www.extreme4wheelin.com/tech/alternators/tech.htm
http://jeepsunlimited.com/forums/showthread.php?t=454538&highlight=ALTERNATOR+CONVERSION
http://www.jeepsunlimited.com/forums/showthread.php?t=466245&highlight=alternator

Trust me I have more but this should get you what you want to know.
 
Last edited:
Hello dayriesw and welcome The draw back with those alternators is that they don't start charging until you "excite" the alt (rev the engine).

I love to "excite" my alt. It's a V8 thing.:D
 
And this is a lot cheaper than what I did.:chug:

I did the same as above only I pulled mine and misc parts from a caddy in the junk yard, LOL.
Also I didn't modify the stock mount I just used a universal chevy alternator bracket cut
down a little to make my mount and got a new belt.

Check out this link on how to wire the fan first then check the alt threads below:
Electric Fan Diagrams, and other stuff... - JeepForum.com
Ford Taurus Two Speed E-Fan Install (pics) - JeepForum.com
Taurus fan upgrade? - JeepsUnlimited.com Forums

Links:
Good diagrams on wiring it here:
At a loss about my charging system - JeepForum.com
One wire alt:
OneWireAlternator
Misc alt info:
Alternator Tech
SI-CS ALTERNATOR CONVERSION - JeepsUnlimited.com Forums
alternator - JeepsUnlimited.com Forums

Trust me I have more but this should get you what you want to know.
 
depending on how many amps you want i have a alt off a 85 monte carlo ss and its 78 amps. its alittle more than stock but it bolts right in. just need a meteric bolt for the top mount.
 
Oh a CS133 caddy alt is the same size and makes about 120 amps.
The larger CS144 will need the modded mount or chevy bracket.
The alt amps will be stamped into one of the mounting ears,
if you go scrounge in the yards.
I pulled mine from a pretty clean engine bay then had it tested at autozone.
They will need the year, make,model in order to test it. Total cost was
about $30 from the yard with all the other misc :dung: I grabbed, relays and stuff.
 
Hey Brock what year caddy is that from the cs133.I was thinking if i was to buy new what info would i give them.
Thanx Mike
 
Other vehicles have them also.
Check napas site they usually list if it's a cs133
I believe a 90 caddy eldorado but you'd have to check.
Tons of vehicles came with them.
 

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