BARILLMS Posted June 28, 2007 Share Posted June 28, 2007 Whats the deal with this tail light groud wire thing? What happens when it's not grounded? Will the vehicle start? I have my '88 long bed tail light wiring totally disconnected right now, because I bobbed my bed, and the vehicle will start up but is wanting to cut out and stall on me. I just relocated my gas tank into my tool box, and the cutting out makes me think its not getting gas properly... but then I remembered about the tail light ground wire thing.... I'm not sure. Any help will be great. Thanks Link to comment Share on other sites More sharing options...
feerocknok Posted June 28, 2007 Share Posted June 28, 2007 Check your fuel pump ground. A bad taillight ground will make all of your lighting @#$% up, but your fuel pump ground would be your cutting out problem. Link to comment Share on other sites More sharing options...
BARILLMS Posted June 28, 2007 Author Share Posted June 28, 2007 the fuel pump is inside of the gas tank, right?? I had it out of the tank because I painted the gas tank and pulled everying out if it. It there a "Sending Unit" AND a Fuel pump?? Where exactly is this fuel pump ground located?? Inside the tank? It starts, then sputters and wants to stall.... It seems like its not getting fuel. It could be something that has to do with the gas tank since I had everything apart. Link to comment Share on other sites More sharing options...
BARILLMS Posted June 28, 2007 Author Share Posted June 28, 2007 ALSO... I my gas guage is acting crazy! it's not reading properly. Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 28, 2007 Share Posted June 28, 2007 If the gauge has a bad ground, or the sending unit does, it'll be all over the map. Link to comment Share on other sites More sharing options...
BARILLMS Posted June 28, 2007 Author Share Posted June 28, 2007 Will somebody tell me where the ground is located?? Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 28, 2007 Share Posted June 28, 2007 Okay, there's a couple. There's one at the taillights that grounds the rear half of the truck. Look in the driver's side light. It should work as long as that ground is hooked up. Now, there's also a fuel system ground, and it is under the dash IIRC. Link to comment Share on other sites More sharing options...
BARILLMS Posted June 28, 2007 Author Share Posted June 28, 2007 Lets start over.... 2 Questions: Question 1: Where EXACTLY is the "Sending Unit" Ground wire? Question 2: WHAT HAPPENS when the "Tail light Ground" is disconnected? Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted June 28, 2007 Share Posted June 28, 2007 Lets start over....2 Questions: Question 1: Where EXACTLY is the "Sending Unit" Ground wire? Question 2: WHAT HAPPENS when the "Tail light Ground" is disconnected? Most sending units ground thru them selves. You know where/how they mount. ONE wire out to what ever they trigger. The tail light ground is just that a tail light ground. the trouble is as our vehicles get older stuff corrodes and loosens up. Grounds rust off, loosen up and fall apart. The ENTIRE metal part of the vehicle is the neg side of the batt. SO that tail light ground may be a grounding point for any number of things. Your best bet is to remove it, clean it, remove factory end, reattach NEW end, apply die-electric grease and reattach it. also adding extra grounds can do wonders of severely corroded vehicles and can solve any number of "problems" I recently changed all my battery and charging wires. The MJ now runs MUCH smoother. If you skin a wire and its black inside, thats corrosion. Think of it as crap in a water line. enough crap restricts flow. too much crap no flow...get it? CW Link to comment Share on other sites More sharing options...
Pete M Posted June 28, 2007 Share Posted June 28, 2007 I discovered the hard way that my fuel pump was grounded through the tail light ground. :( Link to comment Share on other sites More sharing options...
SomeNew Name Posted June 28, 2007 Share Posted June 28, 2007 yeah me too... I actually learned that yesterday! Link to comment Share on other sites More sharing options...
BARILLMS Posted June 28, 2007 Author Share Posted June 28, 2007 Haha!! That must be it then!!!!!!!!!!! I don't have those wires conected to anything back in the back. The wire cluster that goes from the front to the back of the bed consists of 5 wires I do believe. I am assuming the BLACK wire is the ground?? Link to comment Share on other sites More sharing options...
87manche Posted June 29, 2007 Share Posted June 29, 2007 Haha!! That must be it then!!!!!!!!!!! I don't have those wires conected to anything back in the back. The wire cluster that goes from the front to the back of the bed consists of 5 wires I do believe. I am assuming the BLACK wire is the ground?? orange wire should be fuel pump 12v+ black or brown will be ground. Link to comment Share on other sites More sharing options...
BARILLMS Posted June 30, 2007 Author Share Posted June 30, 2007 My 5 wires going to the back consist of: Blue, Brown, Black (thicker), Brown w/ stripe, Grey w/ stripe. Only One wire is hot... brake light and left turn signal light up the grey striped wire. The right turn signal does nothing to any of the wires. I hate wiring. Link to comment Share on other sites More sharing options...
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