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Re: Kia Alternator [Re: DennisThompson] #854368
12/23/07 11:12 PM
12/23/07 11:12 PM
DennisThompson  Offline
Body Damage is Cool
Joined: Mar 2002
Posts: 1,396
Utah
The two alternators look the same from the outside just a differant pulley. I can't tell if they are the same inside. I hope that helps a little, Dennis


95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.
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Re: Kia Alternator [Re: uanrap] #854369
12/23/07 11:33 PM
12/23/07 11:33 PM
Lou  Offline
Mudrunner
Joined: Mar 2004
Posts: 360
Chicoutimi,Canada
Regulator!...quite possible...but with this loss of juice with higher rpm, I'd check brushes and springs....just to be sure something simple was not overlooked...
By hte way, in my other car (GM) , I changed a miserable shot Delco diode pack (real POS) for a sturdy Bosch diode pack ...and also had to change the regulator the year after. Both were easy to procure .
And Dennis advise is more than probable, since both cars (Probe and Kia) are Mazda based...If something that sort happens to my Kia,I'll look that way.

Re: Kia Alternator [Re: uanrap] #854370
12/24/07 02:52 AM
12/24/07 02:52 AM
LeadBelly  Offline
Getting the Wheeling Fever
Joined: Jun 2006
Posts: 40
Central Mo
Quote
If you start it, then disconnect the battery, it keeps running, but if you rev the engine, it stalls.


First, a caveat. While this technique (unhooking the battery to check for alternator/generator output) worked great in the days of points & condensers, it can be bad news to computers and other electronics. I can't tell you how many ign. modules and computers I've seen fried when an unsuspecting but well meaning guy "tested" his alternator in this manner. If you have an overcharging situation (caused by a bad regulator or shorted/grounded field winding in the rotor) the battery limits the system voltage to about 18 volts max. Unhook the battery from the system and the voltage can potentially reach 150 VDC!(That's how the old 110 converter kits worked-it disconnects the alternator output from the battery and connects it to an outlet,& full-fields the alternator...then you increase engine RPM until the output is around 110 volts)

Anyway, I have digressed. It sounds to me like your alternator belt is glazed and slipping(a badly glazed belt won't squeal like a good belt). At low RPM it has enough friction to spin the alternator enough to charge a little, but when you race the engine it slips more and you lose everything.

Back in the day of external alternator cooling fans (The Mando [Korean Mitsubishi] alternators used on our Kias have internal fans) you could (with the engine NOT running) grab the alt. fan and try to turn the engine. You should literally be able to move the crankshaft this way. If not, the belt will likely slip under a heavy load (i.e. fan clutch engaged and alternator charging heavily). Since you don't have an ext. alt. fan, you can use a socket (19mm?) and ratchet on the pulley nut. I think you'll be surprised how easily it will slip. Tightening a glazed belt won't help much-the rubber is just to hard to grip the pulley.

good luck,

ks


'99 Sportage 4dr EX 5-speed, unmolested
'98 Sportage 4dr Auto 2wd
'96 Sportage 4dr Auto,235-75x29"tires, custom fabbed hidden receiver hitch and big plans.


Re: Kia Alternator [Re: LeadBelly] #854371
01/06/08 06:24 PM
01/06/08 06:24 PM
U
uanrap  Offline OP
Need a Spot
Joined: Dec 2006
Posts: 10
Hi Group: I did not consider an alternator putting out too much voltage could fry electronics, but since my problem was voltage dropping with higher RPM (by dumb luck) I did not have that happen. When I had the alternator apart, I did notice one of the brushes had a problem. There were two, the shorter one has the braided copper pigtail either corroded or burned through. Just to see if this was the problem (and maybe it could be fixed with just new brushes), I soldered the pigtail back on and put it back together. It made no difference. I also put a wrench on the alternator pulley nut, and tightened until I could turn the engine with the wrench, also made no difference. The final solution was a visit to e-bay, which yielded a used alternator for $30 plus $15 shipping. I put that in yesterday, and all is right with the world again. Thanks for the suggestions. Alan

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