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Most of the time you burn the fuseable link when this happens. The majority of the time this is bolted to the positive post of the starter. There will be a large wire that leads directly to the battery, then at least one more bolted to the same post, one of which leads to the alternator. It is possible to replace the burned section, check the parts store for a replacement fuseable link.

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Q: How do you find and replace a shorted and burnt lead to an alternator on a 1990 Pontiac Bonneville with 3800 engine caused by replacing without disconnecting battery?
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