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Unread 01-23-2013, 11:22 AM   #1
hillbilly51
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1988 MJ Comanche 
 
Join Date: Jul 2009
Location: georgia
Posts: 36
No Turn Signals

Hello
My turn signals suddenly stopped working.
The hazard lights still work.
Does this truck use the same flasher for the turn signals and the hazard lights?
The fuses apparently are good.
I have a Haynes book on this truck but the wiring diagram in the book is crappy and absolutely no help.
Anyone know a web site where I can get a good wiring schematic?
Thanks in advance for any response.
steve

ps....My truck is a 88 model Comanche Chief 4.0 with EFI


Last edited by hillbilly51; 01-23-2013 at 11:23 AM.. Reason: Added model number
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Unread 01-23-2013, 01:32 PM   #2
mj40
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1989 MJ Comanche 
 
Join Date: Jul 2011
Location: north bay/corbeil, ontario
Posts: 282
2 seperate flashers, hazards work with brake light fuse. signal are on another fuse.. top right is the hazards lower left is signals on the fuse block under dash.. pics below..
my 89 had a bad connection at the lower steering wheel by the base of the dash. and it was only my signals..wipers/high beams all worked..
fuse-block.jpg  
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Unread 01-28-2013, 09:26 AM   #3
Timeless
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1987 MJ Comanche 
 
Join Date: Aug 2009
Location: Long Island, NY
Posts: 243
Switch the relay for the hazards and for the turn signals. If the turn signals work and the hazards don't then, its a bad relay.
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Unread 01-28-2013, 09:55 AM   #4
Hitman72
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1988 MJ Comanche 
 
Join Date: Dec 2012
Location: napa, ca
Posts: 78
From what I have read on other posts. You need to check the turn signal fluid reservoir. Its in the little black sphere mounted in the front bumper, passenger side. Haha
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Unread 01-30-2013, 09:18 AM   #5
DoctorBill
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1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Spokane, WA
Posts: 9
I bought my '89 Comanche used and the turn signals didn't work.



I took the Steering column apart and replaced the turn signal switch.
It is a standard GM part. $30

But THAT was not the problem - cause it STILL didn't work.

Finally I gave up and went to an "Automotive Electrical Repair" place
and they found that a wire inside the Fuse Box was burned out !

There is NO WAY that I could have fingered that out myself !

So they tapped into a hot wire and inserted a Line Fuse and powered
my turn signals with that. $85

When I asked why that would have happened - ????
They speculated that maybe the previous owner shorted it out putting
Trailer Wiring in - has a bumper hitch.

The trailer hitch wiring was all BOOGERED up ! Smashed and repaired
what looked like many times....(?)

Electrical repairs are a Bastard if you can't see well and can't stoop
and work under the dash and don't know which wire is which...like me.

DoctorBill

PS - I have the Haynes AND the Chilton "Manuals" which are almost
useless except for toilet paper. Leaves out quite a lot of stuff.

Hitman - CUTE ! Probably works on women at the repair shop !
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Unread 02-02-2013, 07:36 AM   #6
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,329
Quote:
Originally Posted by Hitman72
From what I have read on other posts. You need to check the turn signal fluid reservoir. Its in the little black sphere mounted in the front bumper, passenger side. Haha
This^. Solved my problem, just make sure you dont put the left side fluid in the right side reservoir, then your signals will be backwards.


No seriously I had this problem too. Theres a big pin connector behind the drivers headlight. Take it apart and clean it, plug it back together and add dieelectric grease. Also one of my sockets was bad, make sure you check them.
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Unread 02-02-2013, 09:33 AM   #7
DoctorBill
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1989 MJ Comanche 
 
Join Date: Jan 2013
Location: Spokane, WA
Posts: 9
"You need to check the turn signal fluid reservoir"

I checked mine and it is EMPTY - leaked out !

I've been asking about it at NAPA, O'Rielly, AUTOZONE, SEARS,
etc and they all tell me that they stopped manufacturing it about
1983.

Great !

I was told I can substitute used Vacuum Cleaner Gear Reservoir Oil -
but I have to filter it first and then add 50% Mineral Spirits to thin it out.

Anyone ever done that ?

DoctorBill
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Unread 02-02-2013, 09:25 PM   #8
79chiefs
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1988 XJ Cherokee 
 
Join Date: Dec 2012
Location: Lillington, NC
Posts: 936
Switch the hazards, and blinker relays, and see if that helps, if hazards dont work then the relay is bad.
Also there is NO SUCH THING A FLSHER FLUID, it's just sarcasm.
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Unread 02-03-2013, 12:33 AM   #9
Hitman72
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1988 MJ Comanche 
 
Join Date: Dec 2012
Location: napa, ca
Posts: 78
Quote:
Originally Posted by DoctorBill View Post
"You need to check the turn signal fluid reservoir"

I checked mine and it is EMPTY - leaked out !

I've been asking about it at NAPA, O'Rielly, AUTOZONE, SEARS,
etc and they all tell me that they stopped manufacturing it about
1983.

Great !

I was told I can substitute used Vacuum Cleaner Gear Reservoir Oil -
but I have to filter it first and then add 50% Mineral Spirits to thin it out.

Anyone ever done that ?

DoctorBill
You are right, vacuum clearner gear reservoir oil does work. But if you really want to do it up right you should use some Bold Eagle egg yoke in it, last fluid change you will ever have to do lol!!!
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Unread 02-09-2013, 01:44 PM   #10
hillbilly51
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1988 MJ Comanche 
 
Join Date: Jul 2009
Location: georgia
Posts: 36
Fixed

The problem was corrosion in the fuse terminal.
I cleaned the connection, replaced the fuse and the turn signals worked.
Apparently I have a water leak onto the fuse panel.
Thanks for all the responses
steve
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Unread 02-09-2013, 01:58 PM   #11
Hitman72
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1988 MJ Comanche 
 
Join Date: Dec 2012
Location: napa, ca
Posts: 78
Do you have a manual?
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Unread 02-09-2013, 03:52 PM   #12
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,329
Quote:
Originally Posted by Hitman72
Do you have a manual?
X2 could be the slave cylinder leaking
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Unread 02-09-2013, 04:37 PM   #13
Hitman72
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1988 MJ Comanche 
 
Join Date: Dec 2012
Location: napa, ca
Posts: 78
In mine (as most of them do) the *master* cylinder leaks onto the top of the fuse box
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Unread 02-09-2013, 05:23 PM   #14
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,329
Quote:
Originally Posted by Hitman72
In mine (as most of them do) the *master* cylinder leaks onto the top of the fuse box
Yeah its the master for the slave, not the actual slave cylinder. Sorry if that was misleading.
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Unread 02-09-2013, 05:36 PM   #15
Hitman72
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1988 MJ Comanche 
 
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Location: napa, ca
Posts: 78
Ya I figured that's what you were getting at. Haha
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