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1996 Bronco 5.0/E4OD/BW1356
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Discussion Starter #1
I've been chasing some electrical problems for some time and have resorted to asking you guys for help.

My problem is that I DO NOT have dash/hvac lights or running tail lights. I've got the front running lights and the third brake light, but nothing to the tail lights. Here is the funny thing - when I start my pickup with the remote starter the dash/hvac lights and rear running lights work perfectly fine. :wacko

If that wasn't bad enough after I removed and re-installed my dash I've got a battery drain - a new truck battery will last around a week. I do not know if the two are related, but they are driving me nuts. I do not have my ash tray or my 12v power installed - could those be my battery drain?

I'll give you some back story - two years ago I had my truck at the end of a driveway with a dead battery and a spare side post battery. Yeah - stupid impatient me thought I could just rest the side post on my top post and jump start the truck :twak Well being the tard I was I didn't think much about it and pushed the battery posts together and started some makeshift welding - polarities reversed. Doh!

I fried the fuse-able links and a fuse or two, but no permanent damage. I was in a pinch, so I just hacked off the fuse-able links, stripped some shielding down and wrapped the wire around the starter relay. I drove the truck like this for a year without problems- :rockon


Fast forward to now - I replaced my blown transmission, gas tank, fuel filter, brake line, front pads, and timing chain. I got to look over basically the whole truck and I couldn't find anything that would cause those problems. I replaced a dead hazard flasher and recently had the brake and trailer light harness apart, the 7 way and connectors are clean, no corrosion.


A few weeks ago I had running tail lights - what gives? My turn signals and hazards work fine, brake lights too - just no rear running lights...
 

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1996 Bronco 5.0/E4OD/BW1356
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Discussion Starter #2
I want to check the grounds - where should I be looking for them?

I'm going to see if I can find the remote start box under the dash - maybe the plug isn't fully seated or it has a blown fuse... The running lights and dash lights work while the unit is engaged...
 

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yo Kyle,

Turn, Tail, Brake & High Mount, Head Light, Side Marker, Hazard Wiring Diagram in 92-95 Bronco & F Series
Source: by Steve83 (Steve, That dirty old truck) at http://www.supermotors.net/registry/media/831135

&
Brake On-Off Switch, Brake Light & High Mounted Stop Lamp, Back- UP Lamp, License Lamp, Turn Signal, Daytime Running Lights Module, Head Light, Hazard, Trailer Marker Relay, etc. Wiring Diagram in 92-96 Bronco & F 150
Source: by seijirou at http://www.supermotors.net/clubs/fullsizebronco/registry/media/588539

my 96's stop/turn/tail lights wires were almost cut in half on passenger side against 1/4 panel (inner), pull both tail light housings & inspect; wires pinched @ high mount brake light & @ driver's left hand seat belt anchor bolt @ base of B Pillar. See the location diagram

Cluster Illumination Dimmer Circuit Wiring Diagram & Testing in 92-96; "...The only significant difference between 92-96 and '80-91 is that the MFS's DIMMER switch replaced the older beam select switch, but they perform the same function..." see Diagram
Source: by Steve83 (Steve, That dirty old truck) at http://www.supermotors.net/registry/media/694507_1

Should be fuse #10 in cab block for instrument illumination

Ground Location pic in a 92 (driver kick panel); Note by Steve83; "...that's G201 which is for all the windows, courtesy lights, instrument cluster, lighter sockets, blower, & horn switch. Instead of many wires at the ring like I was remembering, they spliced them together in the harness that year..."
Source: by BeastBronk at http://fullsizebronco.com/forum/showthread.php?t=7937&page=3

some by Chilton showing connectors and grounds for exterior lighting;
http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193844.pdf This shows Ground G100 for park, brake, turn etc.
@ LH front of engine compartment, on upper radiator support;
same as above http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193902.pdf

Ground Locations 92-96; G100 @ LH front of engine compartment on upper radiator support & G200, Instrument Cluster ground is inside passenger side kick panel by miesk5 at FSB...
G100, G101, G104 Location Diagram, Engine Area in a 95

Source: by SeattleFSB (Seattle FSB) at SuperMotors.net


[http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193843.pdf This shows Ground G401 for Rear Body Markers


http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193847.pdf
http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193853.pdf

Instrument Cluster
http://content.chiltonsonline.com/content/images/WD/Ford/193/WD_Ford_193863.pdf
 

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1996 Bronco 5.0/E4OD/BW1356
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Discussion Starter #4
Thanks! I'm hoping to dig into the wiring this weekend, the truck goes into the exhaust shop on Friday- can't wait to hear it with a leak free full exhaust system :)

I've got a feeling that it has something to do with the remote start stuff or how it interacts with the system. It's so odd that with the remote start on I've got dash illumination and rear running lights, but when it's off I've got nothing... The simple fact that everything works properly with the remote start on tells me the wiring is good - something is ary with the remote start system.

The RS system should be piggybacked into the wiring, not interrupt it. What specifically controls the dash illumination and rear running lights? Anything?
 

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1996 Bronco 5.0/E4OD/BW1356
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Discussion Starter #5
I started scowering the internet searching for this problem across ANY vehicle and I've come to a few conclusions. Some of these problems are solved by replacing fuses, weather it be inside the cab or under the hood. All of my fuses are good, so I can ignore that. Other folks have mentioned to chase wiring down and look for shorts - but with my truck running via the remote start everything works, no blown fuses. Once in awhile people mention the headlight switch - which got me thinking... My wiring is good, my fuses are good, it's either the remote start or the headlight switch - I'm guessing the remote start is just tapped into the headlight switch to power the running and dash lights. The switch is super cheap, so I'm going to replace it - it's original to me, I've had it out before, but didn't think to look at it too closely.

Either way, the dash is going to come apart, I can replace some burnt out cluster bulbs while I'm in there. I'll report back when I replace the switch, I'm thinking I might do that tonight - I need to drive the truck on Friday.

I've found all sorts of threads talking about lights working but other functions not. The headlight switch controls all lighting features, wiring is good, fuses are good, it's got to be the switch. The remote start system is probably just powering the circuit from behind the switch, so wiring and fuses are good. I'm betting I'm getting power to the headlight switch but nothing is coming out of it for those specific circuits.
 

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yo KYLE,

re; "What specifically controls the dash illumination ...?" it is contr by headlight sw

see LINK above for Headlight Wiring Diagram & Testing in 92-96; "...The only significant difference between '92-96 and '80-91 is that the MFS's DIMMER switch replaced the older beam select switch, but they perform the same function..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net

Look to;
right side - middle "TO TEST"
PANEL LIGHT DIMMER CIRCUIT
CLUSTER DIMMER CIRCUIT
 

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yo,
Seach Web for your remote starter Brand and part # for install and wiring diagrams; then we can see what was cur/spliced and/or effed up by the installer.

My Daytime Running Lights (I installed it) was royally messed-up when a country club Valet used the Bronco to relax in ; he apparently reclined to nap and prob put his shoe up under dash and pulled out wiring when the manager found him. ON way home, I had a smoking set of wires; he or manager tried to re-wire it
 

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1996 Bronco 5.0/E4OD/BW1356
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Discussion Starter #8
I kinda got my idea from looking at those diagrams - it's got to be the headlight switch.

Fuses are all good - so power is going to the switch.
I know for a fact the bulbs and wiring are good as the remote start system proves this via illuminating them.
The remote start HAS to be providing power after the headlight switch to power up the running and dash lights.

This tells me the headlight switch has to be the culprit - I'll check for power via the headlight diagram to make sure, but I'm going to start by replacing the headlight switch.
 
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