Pennock's Fiero Forum
  Technical Discussion & Questions
  All exterior lights shut off suddenly... help?

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
All exterior lights shut off suddenly... help? by jschmidt95
Started on: 05-29-2013 11:13 PM
Replies: 7 (131 views)
Last post by: jschmidt95 on 01-19-2014 01:27 PM
jschmidt95
Member
Posts: 92
From: Farmington Hills, MI, USA
Registered: Jan 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post05-29-2013 11:13 PM Click Here to See the Profile for jschmidt95Click Here to Email jschmidt95Send a Private Message to jschmidt95Edit/Delete MessageReply w/QuoteDirect Link to This Post
1986 Fiero SE Stock V6 Notchback

So i was driving home from my friend's house 20 minutes ago and everything is going fine when suddenly the headlights, interior gauges, and side marker lights all stop working. I have had the headlight motors in the UP position with their relays unplugged for a couple of months and I just replaced the headlight bulbs last week, but have had no other problems. when i popped the hood to investigate I noticed that the radiator fan wasn't running even though the engine was hot. (I have the 180* fan switch and lower thermostat) when i leave the headlight switch in the ON position and remove the keys, the blue dinggy thinggy doesn't ring (it usually does) and nothing else happens. My fusible links are still good.... my battery voltage is good and the engine and everything else still runs fine, including the blinkers and third brake light.

Any Ideas? Thanks

-John
IP: Logged
PFF
System Bot
Bloozberry
Member
Posts: 7760
From:
Registered: Jan 2009


Feedback score: N/A
Leave feedback





Total ratings: 308
Rate this member

Report this Post05-30-2013 06:57 AM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
The only thing all these circuits have in common is Fusible Link B, which is one of the four links attached to the battery junction block. If the link isn't blown (the rust colored portion of the wire, not the black cylinder) then perhaps corrosion has gotten between the eyelet that attaches it to the junction block post.
IP: Logged
theogre
Member
Posts: 29569
From: USA
Registered: Mar 99


Feedback score: N/A
Leave feedback





Total ratings: 552
Rate this member

Report this Post05-30-2013 05:24 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
Unplug tail light fuse check for power on one side of socket.
Power here then likely a dead HL switch.

A fried HL switch can kill most external and instruments lights.

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)


The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

IP: Logged
Gall757
Member
Posts: 10738
From: Holland, MI
Registered: Jun 2010


Feedback score: N/A
Leave feedback





Total ratings: 89
Rate this member

Report this Post05-30-2013 06:08 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The headlight switch is repairable (if it hasn't melted). It is 'old tech' copper sheet metal tabs that bend with age. Usually the first thing to lose contact is the headlight motors, but the light contacts are the same construction. I think you can bend them and get everything to work again.

[This message has been edited by Gall757 (edited 05-30-2013).]

IP: Logged
hnthomps
Member
Posts: 5535
From: Columbia, SC
Registered: Jul 2003


Feedback score:    (18)
Leave feedback





Total ratings: 50
Rate this member

Report this Post05-30-2013 08:39 PM Click Here to See the Profile for hnthompsClick Here to Email hnthompsSend a Private Message to hnthompsEdit/Delete MessageReply w/QuoteDirect Link to This Post
I had a new headlight switch fail on me one night with exactly the same results. Unfortunately I did not have a spare or I could have changed it in a few minutes. I ended up leaving the car at a truck stop 30 miles out of town an calling my wife to pick me up. Retrieved the car the next day, drove it home, swapped in an old switch and all problems were cured.

Nelson
IP: Logged
jschmidt95
Member
Posts: 92
From: Farmington Hills, MI, USA
Registered: Jan 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post01-16-2014 01:21 PM Click Here to See the Profile for jschmidt95Click Here to Email jschmidt95Send a Private Message to jschmidt95Edit/Delete MessageReply w/QuoteDirect Link to This Post
the problem ended up being this fusable link B. the PO had taken it out and put an in-line fuse rated for 15A, and it had simply blown. why? i don't know. but i do remember going through a rather large puddle earlier in the day so...

thanks for everyone's input! I appreciate it!

-John
IP: Logged
theogre
Member
Posts: 29569
From: USA
Registered: Mar 99


Feedback score: N/A
Leave feedback





Total ratings: 552
Rate this member

Report this Post01-16-2014 01:49 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
1. fuse for fuse link is often a bad plan.
2. 15A fuse is too low. HL alone draws 8-10A or more.

find and fix whatever is blowing the link then fix the link itself.
See my Cave, Wire Service
IP: Logged
jschmidt95
Member
Posts: 92
From: Farmington Hills, MI, USA
Registered: Jan 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post01-19-2014 01:27 PM Click Here to See the Profile for jschmidt95Click Here to Email jschmidt95Send a Private Message to jschmidt95Edit/Delete MessageReply w/QuoteDirect Link to This Post
I swapped out the fuse for a 25A one and it's been working fine these past few days... I think it was just a little water from the big puddle I went though. Do you think it is safe to keep this 25A fuse there?
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock