my battery and alt test great out of vehicle but in vehicle battery is not charging alt is testing good says no regulator reading when run charging test in vehicle but works on machine at auto parts s

Asked by manleygmc Jun 05, 2015 at 12:19 AM about the 1990 GMC Sierra 1500 K1500 4WD Extended Cab LB

Question type: Maintenance & Repair

alt electrical 1990 gmc sierra 1500

144,795

T_S_T answered 9 years ago

There must be something causing this issue in the truck wiring,or could be the ECM is bad,not letting it charge the battery.

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manleygmc answered 9 years ago

well i changed ground from battery to block but was curious about ground from chassis to firewall

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144,795

T_S_T answered 9 years ago

Yes the body has to have good ground all so.

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my battery and alt test great out of vehicle but in vehicle battery is not charging alt is testing good says no regulator reading when run charging test in vehicle but works on machine at auto parts s 3 Answers

alt electrical 1990 gmc sierra 1500

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my battery and alt test great out of vehicle but in vehicle battery is not charging alt is testing good says no regulator reading when run charging test in vehicle but works on machine at auto parts s

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my battery and alt test great out of vehicle but in vehicle battery is not charging alt is testing good says no regulator reading when run charging test in vehicle but works on machine at auto parts s

3 Answers

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