1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

1998 GMC Sierra K2500 brake lights work intermittently

Old March 26th, 2017, 3:10 PM
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Exclamation 1998 GMC Sierra K2500 brake lights work intermittently

Hey guys I'm relatively new to this forum so please bare with me please. I tried to search before I started a new post but i didn't find anything with my exact problem so here it goes... My truck is a 1998 GMC Sierra K2500 4x4. All the turn signals, reverse lights, tail lights and license plate lights work fine, no issues there. However, the brake lights do not work all the time. If you're driving down the road and you barely tap the brake pedal then they work fine, but if you push the pedal anymore than a light push then they don't work. I have replaced the brake light switch 2 times with the same results. I've looked at the ground which isn't terrible looking either. I have no idea why the brake lights don't work all the time. Please read all of the info before suggesting anything. I've tried help groups on Facebook but all they have been suggesting is replacing the brake light switch even after I have told them I've replaced it 2 different times. I'm at a loss, my only other idea is in the wiring somewhere but I do not have the time or really the expertise to be messing with the wiring so I would have to send it into a shop at $70/hour and I really don't have the money for that right now so I'm hoping it isn't in the wiring so if you guys have any ideas or have had this issue in your truck, please please please let me know. I'm beginning to get nervous driving my truck around when i literally have brake lights like 10% of the time.
thanks in advanced.
EDIT-- i have checked all fuses and relays pertaining to the brake lights and those are fine. also, when the brake lights do work, ALL 3 work. when they dont work, none of them come on.

Last edited by tman94; March 26th, 2017 at 3:14 PM.
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Old March 26th, 2017, 7:05 PM
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Hate to tell you the same thing again but it's the switch. I had a new 98 back in the day and the dealership even had to put 3 on before they got one that worked. What brand are you buying? Alot of aftermarket electronics for these trucks are garbage right out of the box.
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Old March 26th, 2017, 9:48 PM
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Also check the plug that plugs into the brake switch. It might have a loose wire or it might be making a bad connection.
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Old March 27th, 2017, 7:53 PM
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i found my issue... the wiring is broke.. 3 out of 6 wires are broke and the other 3 have significant damage.

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