Turn Signal Problem

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.

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Turn Signal Problem

Postby Hypnogator » Tue Nov 29, 2011 3:28 pm

I'm having a problem getting the turn signals on my A2 to work. When I move the lever, the light on the switch box comes on but does not flash. The turn signal bulbs do not light. I checked the bulbs by wiring in a hot wire to the light assembly, and they work fine. I tried replacing the flasher, but still have the same problem.

One thing I noticed, in searching this forum, there appears to be a ground wire from the turn signal flasher connector that fits to one of the mounting bolts. Mine doesn't have such a wire, and does not appear that it ever did.

Any suggestions?

Thanks!
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Re: Turn Signal Problem

Postby cstaup » Tue Nov 29, 2011 5:40 pm

Looks as though you found the problem. You might try to disassemble the switch to see if there is any burnt residue, clean that off, might help as weel. If the ground doesn't.
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Re: Turn Signal Problem

Postby 199th MP » Tue Nov 29, 2011 6:20 pm

though i admit i can't remember where i got this info, thus casting doubt on it's accuracy, i thought the control unit got it's grounding from direct contact with the steering column. remove it and clean off where it's attached with emery cloth.
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Re: Turn Signal Problem

Postby svramselaar » Wed Nov 30, 2011 1:38 am

hello

on the flasher unit is the wire C the ground wire
if you want to test the direction lights without the unit connect the A and B together (now the they must work no flash )
wire A is the pulse wire to the switch wire B the power wire to the flasher unit
is your light switch in the correct stand
i think your directional switch is not good
if your switch only connects the control light at the flasher unit and not the front or rear lights the amount of Amps you use is to low for the unit to works on

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Re: Turn Signal Problem

Postby Rickf » Wed Nov 30, 2011 5:45 am

Grounding to the column is just for the light on the unit itself. That will have no affect on flashing. The flasher unit under the dash has to be grounded.

Rick
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Re: Turn Signal Problem

Postby raymond » Wed Nov 30, 2011 7:41 pm

If you are using LED bulbs, it will not flash.

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Re: Turn Signal Problem

Postby Kurt Lesser » Thu Dec 01, 2011 12:08 pm

The ground on the steering column is for the horn. The horn has +24 volts to it all the time with the ignition switch on and the return path is thru the horn button to ground.

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Re: Turn Signal Problem

Postby Rickf » Thu Dec 01, 2011 1:48 pm

Kurt, we were talking about grounding the turn signal switch to the column but what you say also pertains since both take the same path to ground.

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Re: Turn Signal Problem

Postby Kurt Lesser » Thu Dec 01, 2011 9:24 pm

Rick,

I understand what you were suggesting but the only thing in the turn sign control that needs a ground is the lamp so that it'll flash. Everything else is just routing for the output of the flasher unit to the lamps. I found some 24 volt white LEDs for the turn signal control but they're too bright at night.

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Re: Turn Signal Problem

Postby Hypnogator » Fri Dec 02, 2011 2:23 pm

Found where the ground wire was broken off. Will splice another wire to it and ground properly. Thanks, all! :D
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