66 brake light puzzle
Thread Starter
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Freshman User
Joined: Jan 2005
Posts: 36
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From: Ruston, LA
66 brake light puzzle
Hello,
I am looking for non-working brake light suggestions. I have replaced the master cylinder, brake light switch, fuse, and light bulbs. I have working tail
lights and turn signals. Any sugestions?
Thanks, James Q
I am looking for non-working brake light suggestions. I have replaced the master cylinder, brake light switch, fuse, and light bulbs. I have working tail
lights and turn signals. Any sugestions?
Thanks, James Q
Postmaster
Joined: Dec 1999
Posts: 2,813
Likes: 6
From: Connecticut
Have you tried to jump the brake light switxch? Take the 2 wires off it and connect together. They should light up. if so, the brake light switch is bad. If not, there's a break in the wires somewhere or the signal light switch under the steering wheel is bad. They route the brake lights thru this for some reason. Test the B/light sw. wires with a test light, you should have power in one of the 2 wires.
Barry
Barry
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
Been some time since worked on my 65 brake system. Wonder if can test circuit by removing the 2 wires from the brake switch, assuming pressure type, and while one presses brake pedal can someone test across the switch. Since mentioned also replacing M/C wonder if air pocket not allowing required pressure to activate switch. At least determine if switch is faulty and start from there.
dave
dave
Last edited by daveengelson; Feb 21, 2005 at 03:55 AM.
Tuned
Joined: Oct 2003
Posts: 386
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From: Wichita, KS
I made a litlle drawing for future reference if I ever needed it, if My drawing is incorrect please let me know I would hate to have led someone astray. anyway I had the same problem and it was my connections under the bed back by the rearend. there should be 3 wires which split into 4 (2 to each side) mine were all cracked and not connecting good. once I replaced all of them it all works flawless. you might try messing with this area.Brake diagram between axle and bumper
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Dave, One of the wires should be hot with the ignition switch turned on. You gotta have that before you can go any further.
John
John
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Senior User
Joined: Jan 2005
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From: Fate, TX
My brake lights work even with the switch off. The air void in the Master Cylinder was a real pain in the A** for me. Dave, where were you when I was slashing my wrists over this problem. Redid the whole wiring harness from the bed back without success, then a very wise man suggested I try to bleed fluid at the switch. BINGO!
Thread Starter
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Freshman User
Joined: Jan 2005
Posts: 36
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From: Ruston, LA
Hello all,
Thanks for the suggestions! Voodoosurfer, I could not open the link you posted. The air pocket below the switch sounds like a possibility as well. Where is the ground strap at the rear of the truck?
Thanks again, James Q
Thanks for the suggestions! Voodoosurfer, I could not open the link you posted. The air pocket below the switch sounds like a possibility as well. Where is the ground strap at the rear of the truck?
Thanks again, James Q
Postmaster
Joined: Dec 1999
Posts: 2,813
Likes: 6
From: Connecticut
Behind the rear lamps you'll see a ground wire going to the body. Clean where they attach and also make up a ground wire to connect to the frame. It won't hurt to do this even if it's not the problem.
Barry
Barry
Thread Starter
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Freshman User
Joined: Jan 2005
Posts: 36
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From: Ruston, LA
Hello Barry,
I looked under my truck and all I see is the rear light harnesses. I don't see any grounds at all. Could I ground from the lamp assemblies to the frame? This is a stepside truck. Also, do my working turn signals rule out the switch under the steering wheel being bad?
Thanks for all your help, James Q
I looked under my truck and all I see is the rear light harnesses. I don't see any grounds at all. Could I ground from the lamp assemblies to the frame? This is a stepside truck. Also, do my working turn signals rule out the switch under the steering wheel being bad?
Thanks for all your help, James Q
Postmaster
Joined: Dec 1999
Posts: 2,813
Likes: 6
From: Connecticut
No it doesn't rule out it being bad. Take the tail lamps off the brackets and clean where they mount. Make sure they're nor rusty inside. You may have to hook a ground from the body to frame. Did you try bleeding the air out at the master cyl?
Barry
Barry