HOW TO: Blinking side markers

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Dimebag
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HOW TO: Blinking side markers

Post by Dimebag » 13 Apr 2008 18:29

Today I finally did this mod and discovered how ridiculously easy it is. There has been some previous discussion regarding this, so I hope this satisfies inquiring minds.

This is what the stock wiring looks like (driver side):
flashing marker mod 001.jpg
As has been previously discussed, the theory here is that we use the front signal bulb filament as the side marker light's path to ground. When the signal lamp is not illuminated, the side marker light is lit. When the signal lamp is activated, it creates a situation where there is +12V on either side of the side marker light filament - the potential difference become 0 Volts, thus causing the side marker light to extinguish while the front signal lamp is illuminated.

Some folks go to great lengths to preserve original equipment wiring when performing mods. I'm not one of those, as you will discover in this tutorial.

The first thing to do is cut side marker lamp ground wire at the splice connector. (You can use a new bullet style splice connector if preserving the original wiring means a lot to you)
flashing marker mod 002.jpg
Congratulations, you're possibly half way there! All that remains is to splice your newly liberated ground wire to the front signal lamp power wire. There are a variety of splice options. This squeeze type is not my favourite, especially in the engine compartment (mostly for environmental considerations - corrosion etc) but it's what I happened to have on hand.
flashing marker mod 007.jpg
So in your excitement, you rush to test your new 'aftermarket' option... but wait! What the f&%*@ - It doesn't work?? grumble grumble That John guy is full of horse manure. Ahhh yes. This happened to me - so what happened? The signal came on but wouldn't 'flash' and the the side marker is still on. This means that the side marker is still finding a path to ground. But how is that possible since we cut the ground wire and spliced it to the front signal power wire?
Last edited by Dimebag on 13 Apr 2008 18:47, edited 1 time in total.
John Thiessen
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HOW TO: Blinking side markers

Post by Dimebag » 13 Apr 2008 18:37

It turns out that the side markers were being grounded through the metal body of the lamp housing through the mounting screws to the retaining clips on the fender. This was confirmed when I removed the screws, let the fixture hang as in the picture, and everything started working as it should.
flashing marker mod 005.jpg
A trip down to the auto parts store netted some nylon inserts to insulate the mounting screws from the metal fender. I suppose if you have fiberglass fenders you won't have this problem. I had to ream the clip holes slightly so they would accept the new nylon inserts.
flashing marker mod 006.jpg
Problem solved! But the signals sure are slow. Not slower than before, but while I'm working on the signal system, lets deal with that too...
Last edited by Dimebag on 13 Apr 2008 18:49, edited 1 time in total.
John Thiessen
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HOW TO: Blinking side markers

Post by Dimebag » 13 Apr 2008 18:45

I still had the factory bi-metalic turn signal switching unit installed. It's pulses at a decent rate when the motor is above 2000 RPM, but at 600 RPM standing at an intersection they are impossibly slow.

The OEM flasher is secured to the dash frame behind the fuel/temp gauges (silver can with white plastic connector on top of it, center of photo)
flashing marker mod 003.jpg
$7.00 later I'm in business with a new 'electronic' flasher that plugs right in - a nice constant signal frequency no matter what the revs are at.
flashing marker mod 004.jpg

And there you have it folks. All's well that ends well.
John Thiessen
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Re: HOW TO: Blinking side markers

Post by jason » 13 Apr 2008 19:09

Nice work John, funny enough, I was just talking to Keith about this today!
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Re: HOW TO: Blinking side markers

Post by qwik510 » 13 Apr 2008 19:15

Hey John,

I have been meaning to do that too. I had read about it in the first issue of the Dime Quarterly. The said to use nylon screws.Either way, glad to here it works.

Here is a link to the DQ article:

http://dimequarterly.tierranet.com/arti ... _lite.html
Enjoy The Ride!
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Re: HOW TO: Blinking side markers

Post by scotth510 » 14 Apr 2008 20:36

Does anyone know if that electronic flasher will work for a 68 510?
Scott
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Re: HOW TO: Blinking side markers

Post by 68Datsun510 » 27 Mar 2018 04:52

scotth510 wrote:Does anyone know if that electronic flasher will work for a 68 510?
Scott
Yes
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Cody Mould
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Re: HOW TO: Blinking side markers

Post by Byron510 » 27 Mar 2018 06:27

Thread from the dead!
But still a good modification- thanks for the bump, it was entertaining as these Realm memeber above have long moved on with exception of David. But the modification is still a good one.

Just for refference, the 68 side marker light was never an a marker light in the first place, and came factory that year as a turn signal light only, so in reverse you could gain a side marker light out of a 68 with this modification.

Byron
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because the opposite never works.

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Re: HOW TO: Blinking side markers

Post by Dimebag » 27 Mar 2018 08:22

:D
John Thiessen
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Re: HOW TO: Blinking side markers

Post by 68Datsun510 » 27 Mar 2018 08:41

Byron510 wrote:Thread from the dead!
But still a good modification- thanks for the bump, it was entertaining as these Realm memeber above have long moved on with exception of David. But the modification is still a good one.

Just for refference, the 68 side marker light was never an a marker light in the first place, and came factory that year as a turn signal light only, so in reverse you could gain a side marker light out of a 68 with this modification.

Byron

Yeah, I saw the last post date and just went for it! Ha! Funny though on my 68, it was definitely wired only as a sidemarker, and all original wiring. PL51024822, so, lowish serial #...? Have a 69 currently with the same mod! =D
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Cody Mould
'69 510 4-Door
Cameron Park, CA
Sacramento Datsun Owners
~Visit Sacramento Datsun Owners on Facebook!

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Re: HOW TO: Blinking side markers

Post by Byron510 » 27 Mar 2018 16:37

Dimebag wrote::D
Awesome that your still lurking John - hope you are doing well.

Cody - I had to go out and look at my 68 in the driveway to see if it could be hooked up either way on my '68. But nope, the non US MY '68 cars seem to have the fender light only as a signal light, the factory wiring can't be hooked up in reverse without cutting or modifying. But I had the check.

Mines a relatively low number car as well P05174 (not PLXXXXXX as it's a 1300 car), but both my 06061 car and my 35XXX serial number car were wired with the side fender light working only with the signal light, but all were non USDM cars.

I know that the MY'69 and later cars we got in Canada as noted above in John's post were identical to the USDM cars in this regard, all side markers were just that - side markers from 69-73 in both the US and Canada.

Still a great mod, though - and still an enjoyable thread from the dead relapse :-)

Byron
Love people and use things,
because the opposite never works.

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