93 coupe alternator ??
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Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
93 coupe alternator ??
Went to start my '93 yesterday and got not much more than clicks from the starter. Battery voltage across the terminals was down to 11 volts
I had a tender connected for the last two weeks.
I have a 10A charger and got it on the car but I watched the amps gauge drop very quickly from 8A to about 1.5A But the car started within 10 minutes of the charger being connected.
I decided to check the voltage again and I found that voltage at the battery terminals was 14.5v with the engine running. Voltage at the alternator post was 14.7v 
The alternator is a CS144 with 140A output. Was this particular alternator (GM p/n 10480138) installed in all '93 coupes? Seems like a lot of output??
I'll be taking the car to my shop to get the battery load tested (8 year old DieHard Gold) to see if the battery is good, but I wonder if the high voltage output may be killing the battery?
Ideas?
I had a tender connected for the last two weeks.I have a 10A charger and got it on the car but I watched the amps gauge drop very quickly from 8A to about 1.5A But the car started within 10 minutes of the charger being connected.
I decided to check the voltage again and I found that voltage at the battery terminals was 14.5v with the engine running. Voltage at the alternator post was 14.7v The alternator is a CS144 with 140A output. Was this particular alternator (GM p/n 10480138) installed in all '93 coupes? Seems like a lot of output??
I'll be taking the car to my shop to get the battery load tested (8 year old DieHard Gold) to see if the battery is good, but I wonder if the high voltage output may be killing the battery?
Ideas?
Melting Slicks
Joined: Jul 2008
Posts: 2,269
Likes: 142
From: Ottawa Ontario
A battery tender can easily bring a healthy battery up from 11 volts. 14.5 volts from the alternator is perfect.
