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Unread 10-24-2011, 12:53 AM   #1
Jeremiahsharp
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1990 YJ Wrangler 
 
Join Date: May 2011
Location: Wenatchee, Wa
Posts: 10
Sputtering when i turn on any lights or heater

My yj wrangler runs fine during the day but when I turn my headlights on or blinkers or kcs or heater it starts to sputter and backfire I need help I guest I had the alternater and battery tested everything was good iam in the dark right now I do all my own work so as much detail would be nice thank you I just want it to run smooth again.

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Unread 10-24-2011, 04:11 AM   #2
sprngrider
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1994 YJ Wrangler 
 
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Is this only happening at idle, or while driving down the road? Are you saying you dont use your blinkers during the day?
Hook up a voltmeter to the battery when you turn on an accessory, see what the output is. Should be between 10 and 14.
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Unread 10-24-2011, 10:59 AM   #3
Brown Dog
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1991 YJ Wrangler 
 
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I think you have a short to ground somewhere in the headlight circuit.
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Unread 10-24-2011, 12:36 PM   #4
Jeremiahsharp
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1990 YJ Wrangler 
 
Join Date: May 2011
Location: Wenatchee, Wa
Posts: 10
Happens at an idle and driving I had the battery tested and I was Gunna pull the alternator out today to have it tested but idk the lights and everything work when the motor is off but when it's running it wants to die
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Unread 10-24-2011, 12:59 PM   #5
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,544
You are loading the alternator and it can't keep up. The stock alt. is 60 amps. If you are running KC's and other after markets you are asking too much of it. Look up the CS-144 alternator mod in the FAQ or search for it on line. It's a good mod to do and will take care of your issue.
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Unread 10-24-2011, 06:53 PM   #6
nembudonna
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1990 YJ Wrangler 
 
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Location: northwest, ark.
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Quote:
Originally Posted by Brown Dog View Post
I think you have a short to ground somewhere in the headlight circuit.
A bad ground somewhere gets my vote also. It happens all the time.
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Unread 10-24-2011, 09:15 PM   #7
Jeremiahsharp
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1990 YJ Wrangler 
 
Join Date: May 2011
Location: Wenatchee, Wa
Posts: 10
I went and bought a new alternator and now it holds a charge but it's still running rough I put new spark plugs in it as well then I looked at the air filter and it was covered in mud so new air filter and clean all the spark plug wires and cap and rotor look good idk why it's running so rough still any other ideas the headlights and kcs work I went with a 90 amp alternator so it has more pull
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Unread 10-24-2011, 10:27 PM   #8
nembudonna
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by Jeremiahsharp View Post
I went and bought a new alternator and now it holds a charge but it's still running rough I put new spark plugs in it as well then I looked at the air filter and it was covered in mud so new air filter and clean all the spark plug wires and cap and rotor look good idk why it's running so rough still any other ideas the headlights and kcs work I went with a 90 amp alternator so it has more pull
What the heck does idk mean. Wait, Maybe I don't want to know.
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Unread 10-24-2011, 11:10 PM   #9
lclark2074
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1990 YJ Wrangler 
 
Join Date: Nov 2008
Location: RI
Posts: 681
Ok first use a volt meter on the battrey set the volt meter on dc 20 volt scall . Turn the jeep on put the jeep in nutral then cheek the battrey. Then put the lites on check to see how much the volts drop. Next chang the scall to AC 20 volt scall . tell us what the numbers are. I got a cuppel of ideas what may make this hapen but do this first.
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Unread 10-24-2011, 11:20 PM   #10
ptwhaler
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Quote:
Originally Posted by nembudonna View Post
What the heck does idk mean. Wait, Maybe I don't want to know.
I had to ask my kids that when I first started texting with my phone. Means 'I don't know'
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Unread 10-24-2011, 11:37 PM   #11
nembudonna
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by ptwhaler View Post
I had to ask my kids that when I first started texting with my phone. Means 'I don't know'
OH. You didn't know like I didn't know. I don't text. Hell, I don't even have a cell phone. I still have a rock tablet. You take care.
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