# 1987 Mitsubishi Montero

**URL:** <https://community.cartalk.com/t/1987-mitsubishi-montero/75930>\
**Category:** Maintenance/Repairs\
**Tags:** montero, mitsubishi\
**Created:** [December 4, 2012, 11:16pm UTC](https://community.cartalk.com/t/1987-mitsubishi-montero/75930 "2012-12-04T23:16:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Shaka](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@Shaka](https://community.cartalk.com/u/Shaka)\
**Post date:** [December 4, 2012, 11:16pm UTC](https://community.cartalk.com/t/1987-mitsubishi-montero/75930/1 "2012-12-04T23:16:47Z")

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My lights, headlamps and interior lights, are going from normal to slightly dim in a rapid sequence. They pulse from normal to slightly dim. Any ideas on what could be causing this?

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [December 4, 2012, 11:22pm UTC](https://community.cartalk.com/t/1987-mitsubishi-montero/75930/2 "2012-12-04T23:22:14Z")

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This could be a sign of failing diodes in the alternator.  
I would suggest having the alternator output checked a.s.a.p. before you wind up killing the battery and possibly getting stranded.

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**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\
**Post date:** [December 5, 2012, 12:55am UTC](https://community.cartalk.com/t/1987-mitsubishi-montero/75930/3 "2012-12-05T00:55:43Z")

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+1. Sounds like the classic case of a failing alternator.