Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Brake lights stay on

Thread Tools
 
Search this Thread
 
Old 04-04-2010, 01:12 AM
  #1  
marneth
Track Day
Thread Starter
 
marneth's Avatar
 
Join Date: Dec 2005
Location: New Beith
Posts: 19
Received 0 Likes on 0 Posts
Default Brake lights stay on

G'day all, After replacing my 4 speed auto box I find that my brake lights stay on and the brake light warning on the dash stays lit. I've searched rennlist archives but can't find anything apart from brake lights not working. Would it most likely be faulty switches on the booster?? Also found out that the red door lights stay on. I dissconnected the rear hatch light switch and they then go out when the door button is pressed. Does this indicate that I need a new rear hatch switch? My shark is a 84S. Thanks in advance
Martin B 84S2 Australia
Old 04-04-2010, 02:04 AM
  #2  
terry gt
Burning Brakes
 
terry gt's Avatar
 
Join Date: Nov 2008
Location: West Vancouver B.C.
Posts: 908
Likes: 0
Received 2 Likes on 2 Posts
Default

Is it possable that you have disconected the brake pad wear sensors wires , when you were working on the trans . ??
Old 04-04-2010, 09:16 AM
  #3  
Landseer
Rennlist Member
 
Landseer's Avatar
 
Join Date: Sep 2007
Location: Johnson City, TN
Posts: 12,143
Received 361 Likes on 209 Posts
Default

Try removing and cleaning the rear hatch switch. They get gunked-up.
Similar thing with door switches. Door threads get corroded, switch itself gets dirty and corroded in several key places. Dwayne has a write up. I've never had to replace one, only disassemble and clean. But every single one has needed attention.
Old 04-04-2010, 09:58 AM
  #4  
blitz928
Race Car
 
blitz928's Avatar
 
Join Date: Apr 2006
Location: South Florida
Posts: 4,772
Likes: 0
Received 2 Likes on 2 Posts
Default

I had a similar problem with my car, it turned out to have originated in a short in the hatch overhead light. Which caused the the harness to from the CE panel to the rear to melt in places. The stray voltage caused my taillights to stay on. I ended up replacing the entire harness to the rear of the car. This is the harness that for the rear interior lights, rear defroster, and taillights. Real pain to trouble shoot.

I started by pulling the panel on the hatch where the sun visors are and found the melted wires., so I knew that there was problem. Then I went to the CE panel and started working back, the harness was pretty bad in places.You can replace with new like I chose to, or perhaps make the repairs. Not a hard job, but plan on spending a day on it, if this turns out to be your problem.
Old 04-04-2010, 12:16 PM
  #5  
Alan
Electron Wrangler
Lifetime Rennlist
Member
 
Alan's Avatar
 
Join Date: Mar 2002
Location: Phoenix AZ
Posts: 13,430
Received 423 Likes on 290 Posts
Default

Originally Posted by blitz928
I had a similar problem with my car, it turned out to have originated in a short in the hatch overhead light. Which caused the the harness to from the CE panel to the rear to melt in places. The stray voltage caused my taillights to stay on. I ended up replacing the entire harness to the rear of the car. This is the harness that for the rear interior lights, rear defroster, and taillights. Real pain to trouble shoot.

I started by pulling the panel on the hatch where the sun visors are and found the melted wires., so I knew that there was problem. Then I went to the CE panel and started working back, the harness was pretty bad in places.You can replace with new like I chose to, or perhaps make the repairs. Not a hard job, but plan on spending a day on it, if this turns out to be your problem.
BTW everyone.. the only way this can happen is when some moron replaces the 7.5A fuse with a 30A (or similar) fuse - because the 7.5A fuse keeps blowing...

Guess what - then the wiring becomes the "fuse" and it just melts "somewhere..." possibly taking other wiring with it - possibly torching the car....

Alan
Old 04-04-2010, 02:15 PM
  #6  
blitz928
Race Car
 
blitz928's Avatar
 
Join Date: Apr 2006
Location: South Florida
Posts: 4,772
Likes: 0
Received 2 Likes on 2 Posts
Default

Originally Posted by Alan
BTW everyone.. the only way this can happen is when some moron replaces the 7.5A fuse with a 30A (or similar) fuse - because the 7.5A fuse keeps blowing...

Guess what - then the wiring becomes the "fuse" and it just melts "somewhere..." possibly taking other wiring with it - possibly torching the car....

Alan
This is true, amazing what a PO won't disclose, upon purchase.
Old 04-04-2010, 11:45 PM
  #7  
marneth
Track Day
Thread Starter
 
marneth's Avatar
 
Join Date: Dec 2005
Location: New Beith
Posts: 19
Received 0 Likes on 0 Posts
Default

Thanks guys, Rear brake light problem turned out to be a blown passenger side bulb found with a carefully placed mirror!! I relpaced all rear bulbs. Will get to the hatch switch later. The rear hatch insert is starting to fall apart after 26 years so I think I'll just replace the entire receiver and deal with the switch then.

Cheers Martin B 84S2 Australia



Quick Reply: Brake lights stay on



All times are GMT -3. The time now is 12:34 PM.