# A/C, clock, pwr windows electrical problems

**URL:** <https://community.cartalk.com/t/a-c-clock-pwr-windows-electrical-problems/33218>\
**Category:** Maintenance/Repairs\
**Tags:** previa, toyota\
**Created:** [July 11, 2009, 12:27pm UTC](https://community.cartalk.com/t/a-c-clock-pwr-windows-electrical-problems/33218 "2009-07-11T12:27:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![renarddumarais](https://avatars.discourse-cdn.com/v4/letter/r/e9a140/32.png) [@renarddumarais](https://community.cartalk.com/u/renarddumarais)\
**Post date:** [July 11, 2009, 12:27pm UTC](https://community.cartalk.com/t/a-c-clock-pwr-windows-electrical-problems/33218/1 "2009-07-11T12:27:28Z")

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On the road the A/C, clock, power windows, radio on my '91 Toyota Previa will suddenly become inoperable. The A/C fan stops and when one tries to lower the windows to cool off they don’t work either. Hitting a bump in the road or crossing a railroad track sometimes causes electrical power to come back on. The vehicle continues to run normally. Sometimes on initial startup none of the mentioned items work. Definately a hit and miss situation. I thinking it may be a failing relay, loose wire, or short… any educated ideas out there???

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [July 11, 2009, 12:34pm UTC](https://community.cartalk.com/t/a-c-clock-pwr-windows-electrical-problems/33218/2 "2009-07-11T12:34:59Z")

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There’s a loose electrical connection somewhere. You’re going to need a wiring diagram to figure out why all of these things are affected simultaneously. I’m thinking a fuse box or electrical junction under the hood.

It could be on the positive side of the circuit or on the ground (negative) side. A bad ground connection could do this.

It’s not a short. A short would blow a fuse, or more than one fuse.

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**Author:** ![renarddumarais](https://avatars.discourse-cdn.com/v4/letter/r/e9a140/32.png) [@renarddumarais](https://community.cartalk.com/u/renarddumarais)\
**Post date:** [July 12, 2009, 1:15pm UTC](https://community.cartalk.com/t/a-c-clock-pwr-windows-electrical-problems/33218/3 "2009-07-12T13:15:30Z")

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Thanks for your post, mcparadise. I have a wiring diagram… so I guess I better get busy.