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lighting problems #1688613 10/21/14 03:24 PM 10/21/14 03:24 PM
Joined: Mar 2004 Posts: 300 St.Louis ,Mo. 7 72sat OP enthusiast
72sat OP enthusiast 7 Joined: Mar 2004 Posts: 300 St.Louis ,Mo.	I have a 87 D250 utility truck. change wiring harness to a 85. I have ground problem with the lights. when lights are on; lights fluctuate like there is a loose ground. checked grounds, battery to engine, bat. to body, wiring harness, all are tight. when I run a ground wire from bat to negative head lite wire, light is bright with no fluctuation

Re: lighting problems [Re: 72sat] #1688614 10/21/14 04:35 PM 10/21/14 04:35 PM
Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,929 Grand Prairie,Texas	Sounds like headlight ground to body is not good. May have to scrape the paint under the ground wire.

Re: lighting problems [Re: 72sat] #1688615 10/21/14 08:42 PM 10/21/14 08:42 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: when I run a ground wire from bat to negative head lite wire, light is bright with no fluctuation I'd solder in a wire T'd to that neg HL ground wire & run it back to as close to the batt neg post (In that ground path) as needed till you get good continuity (& the batt ain't too far away) & going right to the batt neg post as you did when checking would solve it ASAP. or if you want to diagnose, keep checking continuities in the ground path till you find/fix the excessive voltage drop point & you likely would need it running so the vibration will make/break contact which is the light fluctuation you are seeing so you can see when you find the bad spot (poor/loose connection). I would connect a jumper wire with alligator clips to the batt neg post then touch the other end to the eng then to the frame then to the sheetmetal in the vicinity of the headlights till I find the spot that straightens em out live every 24 hour block of time like it's your last day on earth

Re: lighting problems [Re: stumpy] #1688616 10/22/14 12:15 AM 10/22/14 12:15 AM
Joined: Mar 2004 Posts: 300 St.Louis ,Mo. 7 72sat OP enthusiast
72sat OP enthusiast 7 Joined: Mar 2004 Posts: 300 St.Louis ,Mo.	Quote: Sounds like headlight ground to body is not good. May have to scrape the paint under the ground wire. this wiring harness has 2 ground wires for headlights on both sides of the radiator

Re: lighting problems [Re: 72sat] #1688617 10/22/14 04:54 PM 10/22/14 04:54 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: this wiring harness has 2 ground wires for headlights on both sides of the radiator If you touch the jumper to one of the ring terminals that is bolted to the rad & the lights are OK then with your meter on 20 V scale touch the positive meter lead to the batt neg and the neg meter lead to the rad & see how many tenths you show. then rad to rad support then rad support to batt neg till you find the poor/loose continuity (it'll show too high of voltage on the meter) live every 24 hour block of time like it's your last day on earth

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