I have a '99 SE with a 2.5 V6 and I'm going on my third alternator in less than 50,000 miles. Can anyone tell me what's causing this? According to the Haynes manual, theres a mega fuse in the harness. Can anyone tell me where that's at? Thank you.
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Alternator Problems
- Thread starter FordGuy77
- Start date
twocontours
CEG'er
The megafuse is behind the rear ignition coil. If you have the same Hayes as I have check out fig 6.22 on page 6-18. It shows the megafuse connected to large wires above the exhaust manifold. Are you sure the alternator is bad? Most people here will only use genuine Morocraft for alternators as they are the only ones that hold up.
The battery light came on while I was driving, so I got the car home. I lifted the hood and the battery was boiling. My positive cable was all burned up. So, I put in a brand new battery and brand new cables. When I put on a voltage meter on the battery when the car is off, I get 13 volts. When the car is running, I get 18 volts. So, according the Haynes manual, it says if I get more than 14.6 volts, then the voltage regulator is bad. By my understanding, the voltage regulator is on the alternator. So thanks for telling me where the fuse is at and I will go check that. Is it common for an aftermarket alternator to go bad in 20,000 miles?
twocontours
CEG'er
If you're getting 18 volts and current high enough to boil the battery the megafuse is fine. Sounds like a bad alternator. Yes 20K is not unusual for aftermarket. Do a search and you will find people that have put 5 or more in before they got a good one.