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1991 164L
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27,870 Posts
13.7 to 14.6v

You probably need a new internal voltage regulator in your alternator.

Do you have TS 4 cylinder model with or without A/C? Does it have a narrow V-belt pulley on alternator or flat poly-v wide belt pulley?

60743883 maybe AR part number of regulator for your 4 cylinder 164.

Our 115A V6 alternators uses a 9950118 regulator which I can find afftermarket ones on ebay
 
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