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#1 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Brake + Turn Signals = Not Working
Anyone got some insight on this type of trouble?
Rear: Tail lights = Yes Marker lights = Yes Brake lights = No Turn signal = No Front of cab is working ok. No power to two of the three wires at the rear connector. Does this sound like a bad brake switch or turn signal switch? Not sure if the rear turn signals go through the brake switch or not. Any help greatly appreciated. We don't think it is a ground issue since there doesn't seem to be power at the plug for two.
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#2 |
Registered User
Join Date: Feb 2014
Location: Wyoming
Posts: 145
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Re: Brake + Turn Signals = Not Working
The brake lights sounds like a bad brake switch and the turn signals could be the switch in the column or maybe just a bad relay. Electrical problems suck I'm going through some myself. Good luck.
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#3 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Thanks man
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#4 |
Registered User
Join Date: Feb 2014
Location: Wyoming
Posts: 145
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Re: Brake + Turn Signals = Not Working
Ya I would try changing the switch in the column. Sounds to me like that's the problem.
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#5 |
Registered User
Join Date: Dec 2012
Location: Olathe, KS
Posts: 23
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Re: Brake + Turn Signals = Not Working
Have you had your steering wheel off lately?
Silly as it sounds mine kept blowing fuses for the tail/brake lights because I pinched/shorted a wire when re-installing the turn signal assemble under the steering wheel. My wife thought I was nuts; I had been studying the schematics and said "son of a b*&%#", went to the garage and came back in 15 minutes and told her I had fixed my problem. My $.02 worth, won't hurt to check it out... |
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#6 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Haven't taken the steering wheel off. I do need a new one though. The last time they worked was just before I got pulled out of a muddy service road in the rain.
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#7 |
Registered User
Join Date: Feb 2012
Location: Southern Ohio
Posts: 292
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Re: Brake + Turn Signals = Not Working
Everything grounded properly?
These days with any electrical problem I have the first thing I check are grounds. |
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#8 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Thanks for the feedback everyone.
Heavymetl, mostly all properly grounded. There are a couple areas I'll be addressing. But we're thinking it isn't a ground issue since there's no juice hitting 2 of the 3 wires on the connector (rear/frame) for the harness. If we followed those wires back to the cab, would they lead to the turn switch in the column before anything else?
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brake + Turn Signals = Not Working
mostly all properly grounded?? what the heck does that mean?? they are grounded or they are not grounded?
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#10 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Brake + Turn Signals = Not Working
It's pretty easy to check the power through the turn signal switch.
Check for 12 volts on the white wire from the brake light switch with the prdal depressed. If it checks for 12 volts then check for 12 volts on the green and yelllow wires in the steering column harness with the brake pedal depressed. If that checks the the power break is in the harness to the rear of the truck. To check the turn signals- check for power on the purple wire in the steering column harness with the key on. If you get 12 volts, Turn the switch lever to left turn and check for 12 volts on the yellow wire in the harness. If you get 12 volts then turn the switch lever to right turn and check for 12 volts on the dark green wire in the harness. If you get it there too then your problem is between the cab connector and the rear of the truck in the harness or the connectors. If you don't get 12 volts on these wires then the problem is in the turn signal switch.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#11 | ||
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Quote:
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project: "my happy mess" Last edited by litew8; 07-12-2014 at 09:54 PM. |
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#12 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
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Re: Brake + Turn Signals = Not Working
Is the turn signal harness plugged all the way in?
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#13 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
From under the dash? Haven't gotten that far yet.
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#14 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
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Re: Brake + Turn Signals = Not Working
Yes, check the horseshoe connector and make sure it's plugged in all the way. I had a turn signal problem that drove me nuts, front signals worked but the rears did not. Turned out the connector was plugged in at a slight angle and not seated all the way.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#15 |
Senior Member
![]() Join Date: Oct 2010
Location: Cadiz, Ky
Posts: 512
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Re: Brake + Turn Signals = Not Working
Check the wire from the firewall to the rear connector. I had one that came in contact with the exhaust and burned it into. It can be any of these things.
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1972 Chevy LWB Roadster 1999 Chevy Silverado 2wd 2015 Chevy High Country 4x4 Crew Cab |
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#16 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Thanks everyone for the feedback! Monday, we'll check the firewall then the connector under the dash first. If that doesn't provide any positive results, we'll test for power at the switch.
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#17 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Checked the horseshoe connector and firewall. Horseshoe secured OK. Tested the wires per VetteVet instructions. Brake switch tested GOOD. Turn wires are reading funny. Jumps around inconsistently from 3-10 and never hitting 12. Rechecked the plug at the rear and it is jumping/reading the same. Key must not have been turned when we tested the other day which would explain why they appeared dead. Getting the flaky readings for the turn signals, but either way - the brake/turn lights at the rear aren't lighting even a little. My first guess would be corrosion in the turn switch causing the fluctuating readings.
The other strange thing - when the turn signals engage, it causes my tach to jump in sync with it. I noticed also, my tach will jump around when shifting gears (park to reverse to drive to park etc..). Some of this may end up being ground related, but I don't think it all is. Looked at the one ground strap under pass. side cab. It is on, but I don't think I ever removed it to clean it up when we worked on it. Probably the one thing that never got touched ![]() So we are kind of stumped. My guess would be corrosion for the turn switch. Haven't removed it to check. Thoughts?
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#18 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Brake + Turn Signals = Not Working
Separate the steering column harness.
Check for 12 volts with the key on on the purple and brown wires. check for 12 volts on the white wire from brake switch with pedal pushed, If you get the volts then jump from the white wire to the dk green and the yellow wires. look for the brake lights to come on. Key on. Jump from the purple wire to the yellow and light blue wires and look for the left turn signals to blink. Jump from the purple to the dark blue and dark green wires and look for the right signals to work. Key on. Jump from the brown wire to the four wires above and look for the hazards to come on and blink. If you get these to work then you have bypassed the turn signal switch and it is the problem.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#19 |
Registered User
Join Date: Jul 2011
Location: Des Moines, Iowa
Posts: 3,016
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Re: Brake + Turn Signals = Not Working
Thank you again, VetteVet. We haven't had time to check but when we do I'll report the findings here.
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