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Old 05-10-2006
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constant voltage......

heres the deal.....i got a new system installed. i have 3 volt meters in the truck......one on the radio, one on the power cap, and the idiot gauge in the dash. when i first got my new stereo system, the one in the radio and the one on the cap read out between 14.0-14.3 at idle and at speed. then all of a sudden they started reading really low. then after not driving my truck for about 2 weeks i go to unlock it with the power locks and nothing....now i didn't leave anything on because i am really careful of not doing that......the battery is dead. so i take it to autozone and exchange my battery(gotta love the free 3 year replacement on those Duralast Golds!!). i also have them test my alternator just to see if it is the problem........the alternator is fine so i go home and install the new battery and the alternator and the volt meter in the radio and on the cap is reading a whoping 13.2-13.6 volts.........and now sitting in traffic the idiot gauge will change if i rev up the enging and then fall back down. when idling they read about 13 volts and the highest i have seen in driving is 13.8 volts. also while driving it will go down and stay down with the stereo running. if i turn off the stereo, headlights, and the vent blower, it will go back up to about 13.5 and stay there............

if anyone has any ideas on the problem PLEASE help....i am dumb founded at how the volts went down after changing the battery out..........
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Old 05-10-2006
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you didnt buy any new pullys right?

really I think its not so much of a problem since 13v's is what should be expected while driving with everything on, its just its not as nice as before.

I think you could get a smaller alt pulley that would make it charge more if its really bugging you
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Old 05-10-2006
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Quote:
Originally Posted by KARPE
you didnt buy any new pullys right?

really I think its not so much of a problem since 13v's is what should be expected while driving with everything on, its just its not as nice as before.

I think you could get a smaller alt pulley that would make it charge more if its really bugging you
would a smaller alt pully really work? i know it would make it turn faster but wouldn't that cause the alt to over heat and burn up? if it wouldnt were can i get a smaller alt pully?
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Old 05-10-2006
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Probably a higher current alternator AND a pulley. That's what I did and my power problems are history.

I tried an underdrive pulley and with my electrical loads it was a nightmare. I put the stock pulley back on, and a smaller alternator pulley.

You won't be running more than 3:1 to 3.5:1 ratio so your alternator will stay below the 20,000 RPM max speed. You should be fine. It can hit or exceed 20k rpm for brief moments (like the peak of acceleration). If you spend a lot of time on the redline, then it's not a good idea.
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Old 05-10-2006
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how do i tell if i have a 95 amp alternator or the optional 130 amp alternator?
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Old 05-10-2006
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its a pretty safe bet that you have the 95 amp ALT, but can you get a pic of your alternator or at least see one of the faces? the visual difference is in the vent holes

4 vs 6ish I think, I'd have to look it up but with out pulling it thats the easiest way i know of
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Old 05-10-2006
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How much power are you running? Most stock electrical systems weren't made for aftermarket products. If you can't afford a new Alt yet. Upgrade the big 3. Then look into a H.O. alternator. Motor City Reman you can get a 200amp alt for 215 or so. Look into that.
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Old 05-10-2006
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Quote:
Originally Posted by High Society
How much power are you running? Most stock electrical systems weren't made for aftermarket products. If you can't afford a new Alt yet. Upgrade the big 3. Then look into a H.O. alternator. Motor City Reman you can get a 200amp alt for 215 or so. Look into that.
i was also thinking there is a you pull it yard that i usually get a lot of parts from for a good deal. they have a lot of 96 and newer alternators. i have been told that the 96-98 explorer 4.0's had the 130 amp alternators in them. if that is true would that be a good upgrade and would i HAVE to upgrade my alternator to battery wire with the 130 amp vs. the 95 amp?
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Old 05-11-2006
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Well how much power are you running? 130 might not even be large enough for what you have.

Quote:
and would i HAVE to upgrade my alternator to battery wire with the 130 amp vs. the 95 amp?
Yes you will also have to upgrade battery to ground, and your chassy to ground wire also.



I would recommend 4g or larger.
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Old 05-11-2006
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Quote:
Originally Posted by High Society
Well how much power are you running? 130 might not even be large enough for what you have.



Yes you will also have to upgrade battery to ground, and your chassy to ground wire also.



I would recommend 4g or larger.
other than the stock power, i am running a 800 watt RMS amp and a 60 watt strobe light kit with 6 strobe lights(volunteer fire fighter lights)
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  #11  
Old 05-13-2006
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For 800 watts a 130 amp alt will be fine.
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  #12  
Old 05-13-2006
quest51210
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800rms is about 80 amps+the accesory lights are what 10amps+ the AC or heat is about 20amps+ add in headlights at night thats another 20amps. a 130 amp is cutting it close and i think at idle the explorer only does like 80-90amps which would still be a strain on the system. if you want to play you have to pay. do the big3, the alt and you should be fine. its like second nature to me since i have put up to 3 alternators in one truck this past week+9batteries.
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  #13  
Old 05-13-2006
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Wow! That's almost an electric vehicle now, lol. With 9 batteries, you could drive home on the starter motor...
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  #14  
Old 05-13-2006
quest51210
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Quote:
Originally Posted by n3elz
Wow! That's almost an electric vehicle now, lol. With 9 batteries, you could drive home on the starter motor...
hahaha, it has 4-15's and a soundstream 6500watt rms amp.
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