e30tech.com Forums


Go Back   e30tech.com Forums > Technical > Electronics & Lighting
Register FAQ Members List Sponsors Advertise Shop Search Today's Posts Mark Forums Read







Reply
 
Thread Tools Display Modes
Old 09-18-2006, 11:04 AM   #1
sharkd
Senior Member
 
E30: 1987 325is SpecE30 #59
Location: Durham, NC
Join Date: Apr 2005
Posts: 333
sharkd
Default Fuse #10 Keeps Blowing -- No Apparent Reason

A month ago, after trailering the car back from a race at VIR (about a 45 minute drive), fuse #10 blew out while I was pulling the car off the trailer. This cause the tach, fuel, water temp and econo gauges to go dead, the A/C and blower switches to die and the check light system to stop functioning.

I've checked the dash wiring, the SI board, etc without any apparent luck. The fuse sometimes blows when starting, but generally it's when accelerating -- it seems independent of whether the blower is on or the A/C switch (which operates the Aux fan, only) is pressed. The OBC has power, but it won't show fuel status or mileage.

Prior to that first blown fuse, I had not made any wiring changes, nor had I had any electrical issues. The day before the fuse blew, I had a rather severe off-course excursion (though there was about an hour and a half of track driving between when I went off in T17 and when the fuse blew.)

Any suggestions on where to look first? (Likely culprits?)

I have two days at Summit Point coming this weekend... if I can't find the fault (likely a rubbing wire), does it seem like a bad idea to throw a 7.5amp aircraft circuit breaker into the dash and run wires to the fuse location?
sharkd is offline   Reply With Quote
Guest Message
Tire Rack - Pure Control
Old 09-18-2006, 01:08 PM   #2
bimmer2288
Senior Member
 
E30: 1988 Super 'I'
Location: Provo UT
Join Date: Feb 2006
Posts: 264
bimmer2288 is on a distinguished road
Default

I'm not an expert, but you could have snagged a ground wire while you were off roading. Look in the manual for some wiring diagrams and you may be able to find the locations of your grounds. If one is loose, I would tend to think that it would be your culprit.
bimmer2288 is offline   Reply With Quote
Old 09-18-2006, 01:44 PM   #3
M-technik-3
Senior Member
 
E30: too many and now a e36/5
Location: global aka USAF
Join Date: Oct 2003
Posts: 10,268
M-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud of
Send a message via Yahoo to M-technik-3
Default

Fuse 10 cotrols the reverse light circuit correct? Check that. It goes thru the boot in the shifter cause it to pop due to shorting to ground.
__________________


BBS are like brests, no mater how many sets you see you will always look at them and get excited.

http://www.e30tech.com/forum/showthr...88aba8a&t=9781 My transaction thread has grown stagnant over the years
M-technik-3 is offline   Reply With Quote
Old 09-18-2006, 06:09 PM   #4
sharkd
Senior Member
 
E30: 1987 325is SpecE30 #59
Location: Durham, NC
Join Date: Apr 2005
Posts: 333
sharkd
Default

Quote:
Originally Posted by M-technik-3
Fuse 10 cotrols the reverse light circuit correct? Check that. It goes thru the boot in the shifter cause it to pop due to shorting to ground.
Greg, go ahead and pat yourself on the back... I had "eliminated" the reverse light switch by making sure that the reverse lights were lit when in gear.

On your suggestion, figuring it was easier to check the reverse wiring than pulling the dash and center console to check my relocated check panel (my other suspect), I got the passenger side in the air. Lo, and behold, the giubo had eaten into the green and white wire that carries power to the switch and was starting on the blue and white signal wire. (I wonder if the reverse lights were momentarily lighting up under acceleration.)

Thanks!

Quote:
Originally Posted by bimmer2288
I'm not an expert, but you could have snagged a ground wire while you were off roading. Look in the manual for some wiring diagrams and you may be able to find the locations of your grounds. If one is loose, I would tend to think that it would be your culprit.
A loose/bad ground, particularly the main instrument ground, would explain some of the symptoms, but it wouldn't explain a chronic blown fuse, or the working speedometer.
sharkd is offline   Reply With Quote
Old 09-19-2006, 08:43 PM   #5
M-technik-3
Senior Member
 
E30: too many and now a e36/5
Location: global aka USAF
Join Date: Oct 2003
Posts: 10,268
M-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud ofM-technik-3 has much to be proud of
Send a message via Yahoo to M-technik-3
Default

Not a problem, I had the same issue on my Eta. But mine snapped as soon as I put a fuze in the holder and applied power.
__________________


BBS are like brests, no mater how many sets you see you will always look at them and get excited.

http://www.e30tech.com/forum/showthr...88aba8a&t=9781 My transaction thread has grown stagnant over the years
M-technik-3 is offline   Reply With Quote
Old 11-02-2007, 01:37 AM   #6
d_wierda
Noob [Needs 25 to Sell]
 
E30: 1991 BMW 325i M-Technic (Not a Fake)
Location: Vancouver, B.C.
Join Date: Oct 2007
Posts: 19
d_wierda is an unknown quantity at this point
Default

take ur leather shift boot off, you'll see a wire running into the rubber shift boot, this wire will be frayed or cut. i guarantee you this is the problem, wrap the wire of with some electrical tape, heat shrink watever, problem solved
d_wierda is offline   Reply With Quote
Old 07-02-2008, 07:51 PM   #7
u3b3rg33k
Contributing Member
 
u3b3rg33k's Avatar
 
E30: 1987 325i/A-4 Royalblau Metallic
Location: Waukesha, WI
Join Date: Apr 2008
Posts: 4,706
u3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond reputeu3b3rg33k has a reputation beyond repute
Send a message via AIM to u3b3rg33k
Default

I restrained the reverse light wires with zip ties on mine when I did the slushbox to manual conversion. I didn't want to have to take off my exhaust to fix wiring. I was unaware that they could cause that much trouble though.
__________________

Quote:
Originally Posted by dk View Post
[torsens] they're fucking magical.
Nothing says "triumph of enthusiasm over physics" like a FWD race car.

Last edited by u3b3rg33k : 07-02-2008 at 07:53 PM.
u3b3rg33k is offline   Reply With Quote
Old 07-02-2008, 09:37 PM   #8
Stck
Senior Member
 
Stck's Avatar
 
E30: '91 332iS
Location: Houston, TX.
Join Date: Jan 2008
Posts: 4,589
Stck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond reputeStck has a reputation beyond repute
Default

This is a very very common issue on e30's. The stock clips that hold the wire loom away from the driveshaft are often broken either from age, or someone performing service in the area who doesn't think they need to be replaced.

Zipties perform the function pretty reliably otherwise.
__________________
Stck is offline   Reply With Quote
Old 07-06-2009, 02:30 AM   #9
Soviet1942
Senior Member
 
Soviet1942's Avatar
 
E30: '87 325is (SOLD) '72 VW Campmobile
Location: Miami
Join Date: Oct 2007
Posts: 1,640
Soviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud of
Send a message via AIM to Soviet1942 Send a message via Skype™ to Soviet1942
Default

I'm having the same issue I will tomorrow in the morning to see if that is the issue.

I would also like to add that when I saw the blown fuse I immediately replaced it not knowing what amp was needed (there was a 15 in there so I replaced with another 15), after noticing I replaced it with a 7.5 and it blew as soon as the car got power. Would there be another issue if this had occurred with the 15 was in place of the 7.5 for a period of time?
__________________
No more dirte30. 1970 VW Hightop Adventurewagen

Untucked diving board crew member 025
Soviet1942 is offline   Reply With Quote
Guest Message
Tire Rack - Pure Control
Old 07-06-2009, 03:58 PM   #10
Soviet1942
Senior Member
 
Soviet1942's Avatar
 
E30: '87 325is (SOLD) '72 VW Campmobile
Location: Miami
Join Date: Oct 2007
Posts: 1,640
Soviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud ofSoviet1942 has much to be proud of
Send a message via AIM to Soviet1942 Send a message via Skype™ to Soviet1942
Default

bump
__________________
No more dirte30. 1970 VW Hightop Adventurewagen

Untucked diving board crew member 025
Soviet1942 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 01:32 PM.






Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.