# Firetruck

**URL:** <https://community.cartalk.com/t/firetruck/38972>\
**Category:** Maintenance/Repairs\
**Created:** [November 2, 2009, 11:17pm UTC](https://community.cartalk.com/t/firetruck/38972 "2009-11-02T23:17:48Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![shootie](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@shootie](https://community.cartalk.com/u/shootie)\
**Post date:** [November 2, 2009, 11:17pm UTC](https://community.cartalk.com/t/firetruck/38972/1 "2009-11-02T23:17:48Z")

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i have a 1985 gmc jimmy s15.this has a v6 2.8 litter engine.the faster i drive it the faster the lights flash.when idling normal stops flashing but when i hit the gas it starts flashing.i check every wire i can find and every connection?whats left?

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [November 2, 2009, 11:20pm UTC](https://community.cartalk.com/t/firetruck/38972/2 "2009-11-02T23:20:52Z")

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what lights flash??

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**Author:** ![shootie](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@shootie](https://community.cartalk.com/u/shootie)\
**Post date:** [November 2, 2009, 11:21pm UTC](https://community.cartalk.com/t/firetruck/38972/3 "2009-11-02T23:21:27Z")

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all

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**Author:** ![shootie](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@shootie](https://community.cartalk.com/u/shootie)\
**Post date:** [November 2, 2009, 11:28pm UTC](https://community.cartalk.com/t/firetruck/38972/4 "2009-11-02T23:28:50Z")

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help

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**Author:** ![castironman](https://avatars.discourse-cdn.com/v4/letter/c/2acd7d/32.png) [@castironman](https://community.cartalk.com/u/castironman)\
**Post date:** [November 2, 2009, 11:35pm UTC](https://community.cartalk.com/t/firetruck/38972/5 "2009-11-02T23:35:38Z")

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Have you checked the alternator ?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [November 3, 2009, 12:17am UTC](https://community.cartalk.com/t/firetruck/38972/6 "2009-11-03T00:17:20Z")

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If you have a DVOM, set it to read AC voltage. Start the engine and put the test leads on the battery terminals. If there’s any AC voltage measured at the battery terminals replace the alternator.

Tester