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  #1  
Old August 7th, 2013, 10:31 AM
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blinking dome lights

Well, this is a strange one. When I attempt to sound the horn (push in the directional,) both dome lights blink. Same for when I pull the directional towards me (like flashing the high beams.) Headlamps are also out. I'll be checking all the fuses tonight but was wondering if these symptoms sound familiar to anyone?
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  #2  
Old August 7th, 2013, 10:49 AM
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Maybe a bad ground.
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  #3  
Old August 8th, 2013, 04:48 AM
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Quote:
Originally Posted by o2batsea View Post
Maybe a bad ground.
How would I track that down?
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Old August 8th, 2013, 09:07 AM
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photos

Anyone see anything odd here?
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  #5  
Old August 8th, 2013, 09:18 AM
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Start at the directionals arm. If you happen to have a spare to swtich in, try that. Observe the integrity of the wires and connections there. Work from there. Look up the wiring diagram(s) and see where ground(s) may be located.
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Old August 8th, 2013, 11:39 AM
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Quote:
Originally Posted by rijosho View Post
Start at the directionals arm. If you happen to have a spare to swtich in, try that. Observe the integrity of the wires and connections there. Work from there. Look up the wiring diagram(s) and see where ground(s) may be located.
Thanks. I do have an extra switch and will try that out.
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  #7  
Old August 8th, 2013, 06:59 PM
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Swapped the switch with the same results and am reviewing the wiring diagram but it's mumbo jumbo to me.
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  #8  
Old August 8th, 2013, 11:31 PM
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OK... let's start at the beginning. Try each of these items and tell me what works and what doesn't and what strange things happen when you do each:

Ignition On (look for unexpected lights coming on)
Marker lights (do you get the dash light for them?)
Low Beams
High Beams
Directional Left
Directional Right
Brakes (check all 3 lights, and see if the turn signal light comes on in the dash)
Horn

When you try the horn or the high beams, do you hear the corresponding relays click (the row of little boxes shown in your pictures)?
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Old August 9th, 2013, 09:27 AM
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Ignition on - nothing unusual - check engine, oil, brake, battery, and oil temp (?) come on but go off once started
Marker lights - not on, no dash light
Low beams = not on, no dash light
High beams - front dome light on, rear dome light on
Directional left - trailer dash light and directional light flash once, directional flashes normally after that (actual light and dash light)
Directional left - trailer dash light and directional light flash once, directional flashes normally after that (actual light and dash light)
Brakes - didn't check as I was alone and had noone to see if lamps lighted
Horn - front dome light on, rear dome light on
Both the horn and high beams do get a click from a relay

Other observations:
The front dome light never responds to its switch but the rear dome light does (i.e. I can manually turn the rear dome light on with its switch when ignition on)
Key out of ignition and open rear door - rear dome flashes 6 or 7 times
Key out of ignition - rear dome does not respond to its switch
The blinking of the dome lights I initally reported seems to happen when I have the driver door open and depress the horn or high beam selector
Wipers and A/C work fine

Question: Are any of the other relays the same specs as the headlamp relay? I would like to try and swap them to see if that's part of the problem.
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  #10  
Old August 9th, 2013, 09:30 AM
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Wow. OK give me a bit to trace this out on the wiring diagrams.

Is this truck new to you, or have you had it and it just started doing this?
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  #11  
Old August 9th, 2013, 09:42 AM
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I've had the truck for 6 years but don't normally work on it myself. I have removed the center console, steering column covers, and dash light holder so I have easy access to all the switches, dash lights, fuses, and relays. I appreciate the help and am willing to try anything out.
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  #12  
Old August 9th, 2013, 11:59 AM
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OK, so one day everything was fine, and then the next day everything went crazy? Was any work done to the truck?

This is most certainly going to be a ground, the trick is finding which one.
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  #13  
Old August 9th, 2013, 12:12 PM
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First thing to check will be the infamous ground connector C556... it's under the bonnet on the bulkhead near the center of the truck, it will have 2 black wires going to a ring connector.

I have attached an image from the electrical library that shows it, keep in mind this is for a 300tdi so ignore everything else in the engine compartment, we care about that ground connector.

This connector provides grounding for the following:
  • Rear window heater
  • Headlamp Relays
  • Wiper Delay ECU
  • Turn Signal Flasher
  • Interior Lamps
  • Hazard Lamps
  • Instrument Pack
  • High/Low Beam Relay
  • Wiper Motors
  • Cigar Lighter
  • Headlamps
  • Fuel Tank Level Sender
  • Horns
  • Rear Fog Lamps
  • Radio
  • Heater Blower
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  #14  
Old August 9th, 2013, 12:33 PM
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Quote:
Originally Posted by navydevildoc View Post
OK, so one day everything was fine, and then the next day everything went crazy? Was any work done to the truck?

This is most certainly going to be a ground, the trick is finding which one.
Yes, the truck was at my mechanic's for a three week stint.

------ Follow up post added August 9th, 2013 12:34 PM ------

Thanks, I will give it a shot when I get back to the truck tomorrow afternoon.

Quote:
Originally Posted by navydevildoc View Post
First thing to check will be the infamous ground connector C556... it's under the bonnet on the bulkhead near the center of the truck, it will have 2 black wires going to a ring connector.

I have attached an image from the electrical library that shows it, keep in mind this is for a 300tdi so ignore everything else in the engine compartment, we care about that ground connector.

This connector provides grounding for the following:
  • Rear window heater
  • Headlamp Relays
  • Wiper Delay ECU
  • Turn Signal Flasher
  • Interior Lamps
  • Hazard Lamps
  • Instrument Pack
  • High/Low Beam Relay
  • Wiper Motors
  • Cigar Lighter
  • Headlamps
  • Fuel Tank Level Sender
  • Horns
  • Rear Fog Lamps
  • Radio
  • Heater Blower
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  #15  
Old August 9th, 2013, 01:38 PM
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Quote:
Originally Posted by GaryBaxter View Post
Yes, the truck was at my mechanic's for a three week stint.
VERY important clue. What did they work on?
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  #16  
Old August 9th, 2013, 02:05 PM
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New crossmember, rear brake rotors, brake lines, suspension, bulkhead rust repair, floor panels. He did mention that he had to redo some speaker wiring and had the center console out. When I mentioned the problem I was having, he said his work shouldn't have affected that. He's not the kind of guy to shirk his responsbility but unfortunately we've decided to go our separate ways so bringing it back to him is not an option.
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  #17  
Old August 9th, 2013, 04:54 PM
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OK well in case you don't have a computer nearby or you won't be at the truck for very long, here is a few things to look at in order:

Connector C556

Also with C556 since you have a '97 NAS there will also be a tan/beige-ish block along with the ground lug. Make sure that looks good as it joins all of the grounds together before going to the ring connector.

Everything you are describing means this ground isn't working... power is flowing from the horn back to the ground header (the beige block) and then to the ring... but it doesn't find ground there. So instead it starts looking for somewhere to go.

BUT... you never know, and Lucas the Prince of Darkness has fooled us before. Does the truck start and run OK? Is your Check Engine light on? The "rough road" ECU, which is basically an ABS computer without ABS is also on the same ground.
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  #18  
Old August 10th, 2013, 08:28 PM
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The truck starts and runs fine and the ground connector looks OK to me. According to my wiring diagram, the rear window washer pump and front windscreen washer pump are on the same ground wire but they work fine. I'm not sure where to go from here.

------ Follow up post added August 10th, 2013 08:29 PM ------

No check engine light on.
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