Alternator charging question
Just had a waking thought, as I start my a.m. Coffee
---Not a good one, regarding my recently RE-replaced alternator,
---And whether or not it fixed my electrical gremlin, from June's road race on Sunday.
To set stage
Car was 140,000 miles old, & no electrical gremlins in the build, till last fall Car quit on me, after turn 8 , at a different track
---started sputtering (worse with foot in gas, rpm's better as i lift to a cruise) (quickly progressed to the point I had to lift to an IDLE , for the bogging rpm's to recover)(then the tach PEGs past redline, and car dies)
---i had to have the alternator rebuilt.
---Ran fine thereafter, till Sunday in June at RA
June race at road Atlanta:
Saturday, car ran fine till it was overheating to 240*F, and I bailed out of race. (whole other story, in another thread)
Sunday, before MY qualifying, . . .
The car died (on a buddy who was trying her out), between turns 10a & 12, : "it felt like someone hit the kill switch"
##-he tried to restart, and it didn't even click, IIRC.
##- then he sat there on grass for 15", and the it finally restarted, & he came back to the pits.
Car ran fine for qualifying, for me: I posted my new best time (not super fast)(but a new best FOR ME).
Got to grid WAY TOO EARLY for race
For better or worse, I killed the motor
---And sat there for 20-25" with cool shirt pump, and cool helmet fan running, JUST on the full sized battery.
Made it one lap into race, and it starts sputtering in the esses, and dies at turn 5,
Acting and feeling JUST LIKE it did when the alternator died the 1st time.
Tow back to paddock, car sits, starter clicks, just like a dead battery
Throw in a 30" charge
It starts right up
On that same short 30" charge which let me get the car on the trailer:
---I was able to drive it 5 easy miles to maaco for paint, they had to drive it a few blocks twice.
---then I was able to drive it 15 easy miles to the vinyl wrap place.
---then I almost made it home, put my foot in it on the interstate, and it sputtered, seemed to lose some spark.
---lifted my foot to cruise, all seemed fine,
---made it 5 more miles, started sputtering, tach pegged past red line, and dies (exactly how it did with the first alternator death, and exactly how it did Sunday at race)
Walked to warehouse (5 blocks away)
Got bettery charger and extension cord
40" charge and it started right up.
it NOW has a buddy's "2 month old" alternator.
Now, . . .
for the question:
If I am running underdrive pulleys (which I am)
steeda 25% Under drives
Might that spin my alternator more slowly?
BUT, . . .
Could THAT account for the voltmeter to read low? (autometer, on my dash was reading ~11.8)
And possibly accounting for the shop thinking the old, but freshly rebuilt one, to appear to not be charging?
Reason for worry is that I haven't had a chance to lean hard, on it, to see if it has the goods, and race thus weekend
Voltmeter reading 11.8ish still
Not sure if that is the underdrive pulleys
Or a lingering gremlin
Or expected, to have subpar output with underdrives
Don't really want to wait till RACE day to decide, but am out of time
Long, but thanks for sticking with me if you are still here