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I am not sure if you have a voltmeter in your dash, but one thing you can look for is the gradual dimming of your headlights as you drive along. you will have significant starting issues as your battery is quickly drained. basically, as your alternator fails your battery has no way of recharging itself, and is only able to carry the full electric load for a short period of time

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Q: How do you tell if you need a new alternator in a 1988 Isuzu pickup?
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