Alternator – 10V at idle
#1
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Alternator – 10V at idle
The stock gauge on my S4 shows 10V+/- when stopped (with the brakes on) and 12V while moving. I’m running a duel alternator pulley, but no crazy stereo setups. The lights and dash dim a bit when stopped. Advance auto tested my alt and indicated it was leaking AC current. (They didn't say anything about low volts/amps/etc.)
After reading a few threads, it seems this is normal. If I'm not upgrading, should I just keep my current alternator?
After reading a few threads, it seems this is normal. If I'm not upgrading, should I just keep my current alternator?
#3
Former Moderator. RIP Icemark.
your alt is toast.. why would you think this to be normal??
leaking AC means there are blown out diodes/retifiers
anytime you are under 12.6 volts you are running on battery, not on the alternator.
At idle, you should be at 14.4 volts, and never under 13.5 volts.
leaking AC means there are blown out diodes/retifiers
anytime you are under 12.6 volts you are running on battery, not on the alternator.
At idle, you should be at 14.4 volts, and never under 13.5 volts.
#5
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The S4 alternator is WEAK (60amp) at best why don`t you see if you can round up one from an S5 (80amp) or better yet find an FD (100amp) alternator. There are diagrams, if you search, that show how to alter the wiring so the S5 and S6 (FD) alt.will work in the S4. You can get the plug that fits the upgrade at the bone yard. I found several on other makes of japanese cars besides Mazdas. If you have trouble finding the plug let me know.
#6
Former Moderator. RIP Icemark.
Originally Posted by 2713ddddavid
The S4 alternator is WEAK (60amp) at best why don`t you see if you can round up one from an S5 (80amp)
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