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Alternator Gauge Drops when Stepping on Brake

2117 Views 7 Replies 3 Participants Last post by  robgoudy
I have a '69 Coronet with a 383 and a new battery (automatic trans). The car starts-up and runs, but when I step on the brake, turn on the headlights, etc. the alternator gauge drops quickly from the middle down halfway to dead. When I release the brake/turn off the headlights it moves back quickly towards the middle. Possibly related, when I turn on the turn signals, they light up (inside and out) but they do not blink.
Does anyone have a suggestion on how to fix these issues?
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1 - 1 of 8 Posts
The "D" is discharge. All it means is that the alternator is not putting out enough at idle to power everything so it is pulling from the battery. That's fairly common with the low amperage alternators these cars came with.

1 - 1 of 8 Posts
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