# Lock/radio/dome light dash lights wont work. shorted dimmer while car was one **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [August 29, 2014, 4:52am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871 "2014-08-29T04:52:36Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Zrafferty](https://avatars.discourse-cdn.com/v4/letter/z/e9bcb4/32.png) [@Zrafferty](https://community.cartalk.com/u/Zrafferty)\ **Post date:** [August 29, 2014, 4:52am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/1 "2014-08-29T04:52:36Z")
I was installing a new hu into my car and while doing so i shorted out the electrical system. i checked my fuse box i had a 20 amp fuse blown. i changed it out with a 25 amp to get it back up and running didnt have no 20 amp fuses. what else should i look at. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [August 29, 2014, 5:15am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/2 "2014-08-29T05:15:20Z")
I presume that a “hu” is a “huftner ubenspeedenbrackener” …the one behind the grippenslipper and the 20 amp fuse went to the reverse polarity rotor feeder, in the secondary electrical output of the helix amplifier. Yosemite ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [August 29, 2014, 5:17am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/3 "2014-08-29T05:17:05Z")
I take it hu means radio head unit? ---
**Author:** ![Zrafferty](https://avatars.discourse-cdn.com/v4/letter/z/e9bcb4/32.png) [@Zrafferty](https://community.cartalk.com/u/Zrafferty)\ **Post date:** [August 29, 2014, 5:31am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/4 "2014-08-29T05:31:13Z")
i figured it out ended up being a blown fuse in the engine compartment. and yes hu means Head unit or reciever. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [August 29, 2014, 5:32am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/5 "2014-08-29T05:32:30Z")
Well I’ll be… the guessing game is maybe over!!! I had no idea what the heck he/she was asking!!! Why look at anything else you fixed the problem, but just put in too big a fuse. Replace it with a 20 amp and see if it continues to work ok for the next week. Yosemite ---
**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\ **Post date:** [August 29, 2014, 5:34am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/6 "2014-08-29T05:34:58Z")
Not a good idea to replace a fuse with a higher amperage one. Coworker bought a car for his son and the rear wiper wasn’t working. His mechanic found a 15 or 20 amp fuse where a 10 amp was called for. The wiring harness was damaged due to the incorrect fuse. Three weeks, a replacement wiring harness and $1700 later the car was back on the road. Ed B. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [August 29, 2014, 5:42am UTC](https://community.cartalk.com/t/lock-radio-dome-light-dash-lights-wont-work-shorted-dimmer-while-car-was-one/86871/7 "2014-08-29T05:42:49Z")
Good fuses are cheap. I just bought a pack of 15A bussman fuses for $3.99. I alreasy had 5A, 7.5A, 10A, and 20A. A lot cheaper than a $1, 700 wire harness. Look to the fuse marked for ‘courtesy’. This controls the locks, lights, and memory of the hu.