All, my voltage gauge started moving to the 18 volt side. I noticed that it moved down a bit when i turned on my AC. I noticed also that the inner belt was flapping a bit more than I like, but the outer belt looks fine, so I don't know what to do as I can't really move the alternator further away in the bracket to tighten the innner belt.
If you are truly getting 18 volts you have a problem with the voltage regulator or wiring.
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1985 International rollback, 6.9L 5 speed "Li'l Big Truck"
If the belt is stretched that far, you may be in need of a new one, or maybe you got the wrong one (too long) at some point.
Check your voltage with a multimeter at the batteries with the engine running to see how much it's actually charging, don't rely on the in-dash gauge to diagnose problems. 13.5 volts or so is normal with engine running.
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1986 F250 2WD Super Cab XLT Lariat w/ 1996 front clip. Dually bed & van rearend (2" wider, allows spring clearance). 6.9 w/ approx 120,000mi. Banks non-wastegated turbo system, Beru ZD1A glowplugs, Delphi BB injectors, Kenworth pyrometer, vac/boost gauge, electric water temp/oil psi/voltmeter mounted in dash. 3" Mandrel-bent open exhaust. C6 trans, 3.54 gears. Okiegringo idler pulley. R134a A/C conversion. WMO/diesel blend in one tank.
If your regulator is *(&@#'d up and maxing out the voltage, having the A/C on will use up some of the power and therefore reduce the voltage. If the field voltage is maxed out, the alternator can charge at 18 - 19 volts.
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1985 International rollback, 6.9L 5 speed "Li'l Big Truck"
And I am thinking that once the true charging voltage is determined if it is up on the high side the alternator is fully loaded down causing the belt to flap all the more. Then there is the issue of adding the "idler pulley" to help settle things down [img]/ubbthreads/images/graemlins/smile.gif[/img].
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Bob
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1984 Bronco II 4x4 day to day driver : Winter
2005 Explorer Sportrac 4x4 day to day driver : Summer
1991 F350 / Crew cab , Engine 7.3,E4OD tranny. No Turbo but has propane and pyro gauge. The truck is American, complete with a Miles per Hour speedo. Digital trans. temp gauge and voltmeter. Front Captain seats. Control switches for DRL's , Fog lites, High speed idle, Engine kill and scene lites. On board " York " compressed air, Air horns and built in hose reel behind the rear seat. Power bar distribution box from a 1999 Ford Explorer . Checker plate running boards and Frieghtliner mud flaps. LED turn signals in the factory mirrors. DC to AC inverter to run the coffee maker <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> Soon to be updated with more toys as time & $$$ permit. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
I have a 91' truck too. After I installed new cables and batteries, my voltage regulator showed 18 volts, overcharging like yours is doing. After my truck sat for a few hours, I went out and put my hand on the voltage regulator and it was hot to the touch, draining my batteries. Replaced my voltage regulator and all was fixed.
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1991 F250 XLT, 2WD, 7.3L IDI, 5 speed, 168K.
[ QUOTE ]
I have a 91' truck too. After I installed new cables and batteries, my voltage regulator showed 18 volts, overcharging like yours is doing. After my truck sat for a few hours, I went out and put my hand on the voltage regulator and it was hot to the touch, draining my batteries. Replaced my voltage regulator and all was fixed.
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Yep, replace the voltage regulator. and if you are still having the same problem, take back the NEW regulator and get another until you get one that works correctly. I recently had same problem. Thought I had a wiring short, but it just didn't seem logical to me. First 2 were from O'Reilley's, 3rd was from Autozone and it worked perfectly [img]/ubbthreads/images/graemlins/shrug.gif[/img]. Okiegringo
it's silver or black, about the size of a deck of cards, with a long plug pushed in to one end. Should be sitting either on the inner fender or the wheel well just behind the passenger side battery. Check to see that the body of the regulator is grounded to the truck.
__________________
Bob
My Pictures
1984 Bronco II 4x4 day to day driver : Winter
2005 Explorer Sportrac 4x4 day to day driver : Summer
1991 F350 / Crew cab , Engine 7.3,E4OD tranny. No Turbo but has propane and pyro gauge. The truck is American, complete with a Miles per Hour speedo. Digital trans. temp gauge and voltmeter. Front Captain seats. Control switches for DRL's , Fog lites, High speed idle, Engine kill and scene lites. On board " York " compressed air, Air horns and built in hose reel behind the rear seat. Power bar distribution box from a 1999 Ford Explorer . Checker plate running boards and Frieghtliner mud flaps. LED turn signals in the factory mirrors. DC to AC inverter to run the coffee maker <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> Soon to be updated with more toys as time & $$$ permit. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
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