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Unread 10-21-2011, 12:33 AM   #1
Xpress
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1989 YJ Wrangler 
 
Join Date: Dec 2010
Location: The Great Big Box, California
Posts: 5,809
More electrical gremlins- heater blower

So I noticed tonight while driving, my heater sounds funny. When I get on the gas a bit, it sounds like it's losing RPMs, then once i'm up to speed it returns to a normal RPM. Also, sometimes it feels like i'm losing power and the lights dim.

I had my pair of 100w spots on as well. Could this be an alternator issue? Mine sounds like a grinder, and I know it's probably getting close to time to replace it.

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[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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Unread 10-21-2011, 06:49 AM   #2
jsawduste
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2006 YJ Wrangler 
 
Join Date: Jul 2006
Posts: 3,004
You answered your own question.

I would suggest taking your alt. to a alternator/starter rebuild shop instead of jumping on a replacement from the parts store. You will end up with a better end product for much less $$. And the rebuild shop will have tested the output in AMPS not just measured voltage.

Might consider some of the alt/battery cable wiring upgrades that have been posted lately also.
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Unread 10-21-2011, 07:04 AM   #3
LeeIndy
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1976 CJ5 
 
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^^ this and deffinately replace the ground cable, the cable to the alterntor. the cable to the starter. with GOOD ones.
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Unread 10-21-2011, 12:37 PM   #4
Xpress
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I keep getting this feeling that the battery cables already aren't stock.. They're pretty big, but then again I'm comparing them to what Toyota uses...

I'm also wanting to run a higher output alternator eventually. Should I just go for one before mine dies, or replace mine with an OEM? Unless a shop can rebuild it in a day or less, I don't have the time to get it rebuilt as this is my DD, and with me being on call during the week I never know when I'm going to have to go to work..
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[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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Unread 10-21-2011, 12:39 PM   #5
LeeIndy
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1976 CJ5 
 
Join Date: Oct 2011
Location: macon, ga
Posts: 158
buy a new one and keep the old one as a spare. it will work in a pinch if your new one goes out on the side of the road.
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I love my CJ5. My wife thinks shes gonna fall out.
We can only hope.
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Unread 10-21-2011, 12:52 PM   #6
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
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Replace and upgrade. Lood at the alternator mod in the FAQ. You need the GM alternator CS 144 mod. Well worth it. You can get one from a bone yard for $30.
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Unread 10-27-2011, 06:38 PM   #7
Xpress
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1989 YJ Wrangler 
 
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Okay, I was messing around in the Jeep last night ,and noticed that when the heater sounds like it bogs out, it's actually putting out a LOT more air. Only happens when the rpms are low and I feed in more gas to get up to speed.

What the hell?
__________________
[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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Unread 10-27-2011, 11:29 PM   #8
Flajeeper1
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1987 YJ Wrangler 
 
Join Date: Oct 2009
Location: Lakeland, FL
Posts: 726
Not sure on your problem but clean all ground connections from frame to engine. As for and alternator I suggest going to the CS144 alternator. I upgraded and went to a 1 wire alternator with 140 amps, same alternator bracket with minor adjustments. You'll have all the electrical power you need. You can also collect all your parts, take an afternoon to replace the alternator and then turn in your old alt. for the core charge. I also upgraded to a larger battery.
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Unread 10-28-2011, 10:36 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Sounds to me like your vacuum controls are not set up correctly and you are dropping the vacuum to the switch. If you had a voltage issue you should be able to see dimming in the headlights.
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Unread 10-28-2011, 10:40 AM   #10
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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Read this:

http://www.jeepforum.com/forum/f12/m...es-why-499877/

Go into the FAQ under heating. Amazing amount of info there.
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Unread 10-28-2011, 12:19 PM   #11
Xpress
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1989 YJ Wrangler 
 
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Well now.. It appears that someone had plugged both vacuum lines into each other. I'll plug them back into the heater controls later, but for now the heater is baking me out. Had both windows down with it being a cool morning (about 65*F) and I was being BAKED inside my Jeep

Don't think I'll have issues with keeping warm going down the highway even with my leaky top.
__________________
[URL="http://www.jeepforum.com/forum/f12/another-5-2l-yj-thread-1503048/"]My 5.2L Build thread[/URL]

-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
[QUOTE=mudsweatNgearz;21162729]Leave em off and weld an I beam on. Bumperetts just scream homo.[/QUOTE]
"A well regulated Militia, being necessary to the security of a free State, the [B][I]RIGHT[/I][/B] of the people to keep and bear Arms, [B][I]SHALL NOT BE INFRINGED[/I][/B]."
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