# 2002 F350 Flashers, backup light, backup alarm inop

**URL:** <https://community.cartalk.com/t/2002-f350-flashers-backup-light-backup-alarm-inop/62181>\
**Category:** Maintenance/Repairs\
**Tags:** f350, sensors, electrical-wiring, ford, lights\
**Created:** [March 4, 2011, 8:42am UTC](https://community.cartalk.com/t/2002-f350-flashers-backup-light-backup-alarm-inop/62181 "2011-03-04T08:42:46Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Micpk43](https://avatars.discourse-cdn.com/v4/letter/m/c68b51/32.png) [@Micpk43](https://community.cartalk.com/u/Micpk43)\
**Post date:** [March 4, 2011, 8:42am UTC](https://community.cartalk.com/t/2002-f350-flashers-backup-light-backup-alarm-inop/62181/1 "2011-03-04T08:42:46Z")

</div>

I have a 2002 f350 that I have changed relays, control unit, checked fuses with no change. The hazards work normally. I’m ready to drive it off a cliff. I was told that it could be a bad ground. But no one can tell me where the ground may be. I have looked at the wire run from back to front with no problems found.

---

<div class="post-metadata">

**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [March 4, 2011, 11:32am UTC](https://community.cartalk.com/t/2002-f350-flashers-backup-light-backup-alarm-inop/62181/2 "2011-03-04T11:32:46Z")

</div>

Make sure you know which is ground and which is not, then run a temporary wire from a non-functioning part to the ground post of the battery. I might be a good idea to not connect things at first, use a meter to check it first.

Good Luck