keeps blowing headlight fuses

[Chavez88]

Quick question why every time that i turn on my headlights it blows both the right and left fuses ??? 😩

 i dont know why i didn't touch anything like wires or anything . all the rest of the lights work just fine.. not even my high  bems work.. 😣

 Any help or tips.. CAN I STILL DRIVE IT ??

[Draker]

You probably have short to ground somewhere.. but you're gonna have to get in there and start tracing wires. Did you work on the truck recently? Even if not wiring related.

Edited June 4, 2020 by Draker
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[Chavez88]

yeah i just upgraded the sway bar bushings,sway bar end links and added a radiator reservoir tank 2 days ago..

[datzenmike]

When did this start doing this?

[Chavez88]

just last night i was gonna take her out at night and notice  lights were not coming on, so i check  and they were blown. i replace them and it blew them again ..

[banzai510(hainz)]

clean the contacks on the fuse and reaseat the lamp connectors.

 

of blows fuse again then only hook up one lamp and see if it blows, maybe lamp shorts out but never seen such a thing if anything it goes OPEN with a ohm meter.

 

all connection good at the power lug at starter where it getsit power from , tight?

[datzenmike]

Are they stock glass headlamps or replacement with metal reflectors. 

[Chavez88]

ok for sure once i get home its wierd everything was ok the other day and all of a sudden fuses are blown hopefully is something simple and easy. But u can still drive it right ?? 

thanks guys appreciat🙏e ill keep you guys updated 

[Chavez88]

They are stock headlights 

[datzenmike]

There are two fuses for the headlights one L and one R. They both blow?????

[Chavez88]

Yeah once i turn on headlights they both burn out at the same time. 

[datzenmike]

Power from the two fuses go to the headlamp switch, and when turned on, go to left and right headlamps. High or low beams are selected by a relay that grounds the other side of the lamp to turn them on. So the problem is between the fuses and the headlamps and not on the other side of them.

 

Try to find the 8 pin lighting switch plug near/under the steering column. It will have the following wires on it...

 

Red/Black (stripe)

Red/Blue

Red

Red/Green

Red/White

 

Red/Blue and Red/Yellow are for the parking, clearance, side marker, tail lights and license plate lamps.

 

Unplug and try. If the fuses still blow then at least you know the problem is NOT the switch or anywhere out to the headlamps, but is towards the fuse box. If it doesn't blow then it's the headlamp switch or towards the lamps. 

 

I can see one fuse blowing but both??? Both must share a common grounding to the chassis

[Chavez88]

Yeah my buddy is stopping by tomorrow to give me a hand with it. He has more understanding with all this. I'll keep you guys updated hopefully we can figure this out. 

[datzenmike]

Sway bar links replacement. Did the same myself yesterday on my 710. Think... were you under the hood? were you under the dash or steering column?

[Chavez88]

Nope i was under then truck oh wait i also replaced the radiator reservoir under the hood.