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Joined: Feb 2001
Posts: 7
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OP
Junior Member
Joined: Feb 2001
Posts: 7 |
Buzzing home on a crisp night---racing the trusty olde 98 svt. Then low and behold...around 5500 rpm the lights dim and the dash "battery" light comes on. After a quick shift, I took care of the weasel that thought he could beat me; however the problem continued. That is, any time I rev past 5500 (in neutral or in gear) the charge indicator comes on. Any ideas?
98 svt stock puppy with mobil 1 in the bowl
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Joined: Sep 2000
Posts: 5,805
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Joined: Sep 2000
Posts: 5,805 |
Alternator on the way out....diode pack.......
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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Joined: Oct 2000
Posts: 147
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Joined: Oct 2000
Posts: 147 |
At that engine rpm... could also be brush bounce...
99 SE Sport..ATX
SVT exhaust
SVT zip tube and air cleaner assembly
Tinted windows
17" Cougar Zn Wheels
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Joined: Jul 2000
Posts: 559
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Mine did the same thing for 2 weeks (5,500RPM Shift Light) then it stayed on.
New Alternator and Belt installed.
99 SVT Black/Tan #1090/2760
82K Miles.......B&M Edge Shifter
Mobil1 5-30.....Side Markers
Ford Synth MTX # XT-M5-QS
Locking Lugs....Cup Holders
Black Sail Panels...TH Fix
Aluminum Gas Filler Door
BS Potenza S-03's
KVR Cross Drilled Rotors + Pads
Dual Mode Damper - soon
Clarion head unit
Pioneer 2-ways
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Joined: Feb 2001
Posts: 7
Junior Member
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OP
Junior Member
Joined: Feb 2001
Posts: 7 |
Thanks for you help guys. I'll have the alternator checked out!
98 svt stock puppy with mobil 1 in the bowl
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Joined: Sep 2000
Posts: 1,861
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Almost always an RPM related loss of charging system voltage is from the rotor windings in the alternator. Especially when it is very consistant with RPM rather than from electrical load. As the rotors spins, one of the wires in the windings either opens or shorts from centrifugal force. Since you can't get the rotor by itself it still means you need to replace the alternator.
Back when alternators were routenly overhauled in Ford dealerships (many years ago), I was often the hero for being able to solve this problem when other technicians had failed. They must have fallen asleep during that part of the alternator rebuilding class.
I think that if you remove the alternator and have it tested at an autoparts store you will find that the alternator still acts up only at higher speed (if the tester spins that high).
Jim Johnson
98 SVT
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