Voltage problem - JeepForum.com

 
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post #1 of 15 Old 12-11-2013, 06:12 PM Thread Starter
ChrisCarlock
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Voltage problem

I replaced my alternator, belt, and all pulleys are good. My ground is good.

My volt meter drops as I turn on accessories and then my belt begins to squeal when not under load. Could this be my battery? Gauge flickers with blinker

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post #2 of 15 Old 12-11-2013, 07:10 PM
86cj74.2L
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Tighten your belt more.

I usually tighten Grammys to the point that I turn on all the accessories at once and don't get the belt squeal. Anything tighter then that is prematurely wearing out your alt bearings.

Don't go by the factory volt meter. The meter is sensing its voltage through the ignition switch. And on our CJ's all the electrician load goes through one set of contacts and it drops a lot of voltage.

I ran a wire directly from the battery to the cigarette lighter and use a volt meter for the cig lighter from innova its a lot more accurate then the gauge on the dash.

I also set my idle so I see 13v with all the accessories on. Lights, heater fan, etc.
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post #3 of 15 Old 12-11-2013, 07:28 PM
BagusJeep
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Check your belts again, they wear on the sides and a ridge forms. Eventually the base of the belt contacts the pulley and you start to lose grip, hence they start to squeal even though they are tensioned and look fine.

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post #4 of 15 Old 12-11-2013, 07:28 PM Thread Starter
ChrisCarlock
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My belt is on there nice and tight and I still have the problem. I'll try setting idle higher
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post #5 of 15 Old 12-11-2013, 08:39 PM
LumpyGrits
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Get a new belt
LG

Have'n you along, is like loose'n 2 good men
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post #6 of 15 Old 12-13-2013, 03:59 AM
RWise
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Quote:
Originally Posted by LumpyGrits View Post
Get a new belt
LG
X2, and I would make it the groved belt, they get more traction than smooth belts thus extending bearing life. If the sides of the pulleys are worn, no new belt or any amount of tention will fix it. The belt (new or used) should set at the top of the pulley, not sunk into the v slot of it.
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post #7 of 15 Old 12-13-2013, 04:50 AM
Blakescj7
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hey 1981 cj5, nice to see another oklahoman on here. i was beggining to think i was the only one haha
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post #8 of 15 Old 12-14-2013, 06:05 AM
RWise
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Quote:
Originally Posted by Blakescj7 View Post
hey 1981 cj5, nice to see another oklahoman on here. i was beggining to think i was the only one haha
Well I stop in from time to time, to many interestes and not enuf time or money for them. Do you get to TOR (Tulsa Off Road) several locals there, and local events posted, etc. Oh ya Tulsa is just outside of Oakhurst, with way more rules! You are not alone!!
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post #9 of 15 Old 12-14-2013, 07:36 AM
Blakescj7
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havent heard of it. ill look into it.
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post #10 of 15 Old 12-29-2013, 08:16 PM
mrpete
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Possibly when the alternator was changed, the new one had a narrower groove width pulley. On my '81, the PO changed the alt. and the belt sticks out of the groove. It slips and squeals sometimes. I am restoring my Jeep and am going to a 1/2" wide pulley. The pulley on mine is currently 3/8".
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post #11 of 15 Old 12-30-2013, 05:41 AM
John Strenk
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post #12 of 15 Old 12-30-2013, 04:17 PM
JeepHammer
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That was going to be my next question John...

Does the sides of your pulley bow out and not have a straight 'V' in it anymore? If so, time for a new pulley.
Does the belt bottom out in the pulley? If so, time for a new, or wider belt.

If you are worried about wearing out an alternator bearing, then you don't have the problems with a CJ that I do!
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post #13 of 15 Old 12-30-2013, 06:04 PM
86cj74.2L
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If the bottom of the groove is shiny the belt is riding too low and the shive/ pulley should be replaced. Or the belt is the wrong profile.
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post #14 of 15 Old 12-30-2013, 08:20 PM
scottymac62
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Check your connection where your alternator cable meets the solenoid. This is also where the red, 12v chassis supply cable is present. An easy way to do this is see if the connection gets hot after only a few moments. If it does get hot then I suggest re-terminating them with a crimped wet/solder connection. I had the same problem on my CJ5 and have never had another voltage problem since re-terminating that connection. I also did the JeepHammer battery cable upgrade at the same time. It's very amazing how a CJ acts when you feed her a proper 12v and ground.

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post #15 of 15 Old 12-30-2013, 08:39 PM
86cj74.2L
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Also don't rely on the volt meter as a accurate I indication of battery voltage.

All the electrical load goes through 1 set of contacts in the ignition switch. That also goes to the volt meter. That sense wire is comprised by a high load and poor contact.

I ran a wire directly from the battery to the cigarette lighter. And use a volt meter that plugs into it.

Its from Walmart. Cost around 10 dollars.

As JH said to me once. If it constantly ran at 12.5 volts the battery would be dead by now. And it wasn't.
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