# 1989 Mercedes-Benz S-Class won’t start **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mercedes-benz, s-class\ **Created:** [April 1, 2019, 11:25pm UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763 "2019-04-01T23:25:19Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Mark17](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@Mark17](https://community.cartalk.com/u/Mark17)\ **Post date:** [April 1, 2019, 11:25pm UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/1 "2019-04-01T23:25:19Z")
I have a 89 420 SEL fan belt broke on the ALT , I replaced the belt but now It will not start, no power at all , I replace the battery. Still nothing HELP. ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [April 2, 2019, 1:02pm UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/2 "2019-04-02T13:02:13Z")
Given the small amount of info you’ve posted, the only suggestion I can give you is that the belt knocked a wire off when it failed. Look for a rather large wire hanging loose near the alternator. ---
**Author:** ![kbw\_150702](https://avatars.discourse-cdn.com/v4/letter/k/c77e96/32.png) [@kbw\_150702](https://community.cartalk.com/u/kbw_150702)\ **Post date:** [April 13, 2019, 1:48am UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/3 "2019-04-13T01:48:01Z")
I had a similar problem (wouldn’t start) with a 1990 560SEC. Had it towed to dealer who couldn’t reproduce the problem. The second time it happened, had it towed to dealer and asked that he keep it and drive it until it happens. Finally found that it had a faulty crankshaft sensor. Replaced that and no more problem. I assume that towing the car disturbed the crankshaft enough to make the sensor work. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [April 13, 2019, 3:04am UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/4 "2019-04-13T03:04:43Z")
> [@Mark17](#): > > It will not start, no power at all , I replace the battery. Still nothing HELP. Explain what you mean by “will not start”. Doesn’t crank, that rr rr rrr sound with the key in"start"? Or cranks ok, but doesn’t catch and run? ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [April 13, 2019, 12:55pm UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/5 "2019-04-13T12:55:17Z")
you were driving. belt broke. you stopped? motor did not stall? so we can assume battery was ok. but why did you have to change the battery? were you driving it with broken belt for a bit? that seems odd. i have no idea what the belt arraignment is on a 89 merc. multiple belts? wp is driven by 1? does alt belt drive any other component? like ps? it is 30 yrs old. so i figure it may have had an old battery? new batteries are good. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [April 13, 2019, 2:26pm UTC](https://community.cartalk.com/t/1989-mercedes-benz-s-class-won-t-start/137763/6 "2019-04-13T14:26:31Z")
This vehicle definitely uses multiple v-belts