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1979 LiL Red truck electrical Q #2611736
01/24/19 07:05 PM
01/24/19 07:05 PM
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hemienvy Offline OP
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Front fender side marker lights.

There are two wires going into the bulb socket, 1 brown, 1 yellow.
Brown is side lamp, yellow is directional/hazard.

The bezel is plastic. There are no other electrical connections.

SO, THERE IS NO GROUND CONNECTION, for either circuit, side lamp nor
direction/hazard.

How can this possibly be ? There is also no grounding notation in
the factory electrical diagram.

Anyone else come across this ?

Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2611766
01/24/19 08:04 PM
01/24/19 08:04 PM
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Danny Offline
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Well i didnt realize that they do blink, i didnt know that, had to go out in check

Last edited by Danny; 01/24/19 08:14 PM.
Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2611771
01/24/19 08:20 PM
01/24/19 08:20 PM
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Bend,OR USA
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Cab_Burge Offline
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You are not seeing the path back to the battery for those lights to work work scope
Direct current and alternating current both need to have a path for the electrons to return to their sources to complete the path to make any device work work
There is no magical wireless tech. for the lights on those old trucks to work shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 1979 LiL Red truck electrical Q [Re: Cab_Burge] #2611798
01/24/19 09:02 PM
01/24/19 09:02 PM
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hemienvy Offline OP
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The bulb socket plugs into the plastic bezel. The bezel is screwed
into the sheet metal, which is chassis ground.
There is no electrical connection between the socket and the
mounting screws (chassis ground). None.

Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2611807
01/24/19 09:22 PM
01/24/19 09:22 PM
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chicagoland,usa
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buildanother Offline
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I don't recall those as flashing for turn etc, so there is a B+ wire and the old ground wire.

Re: 1979 LiL Red truck electrical Q [Re: buildanother] #2611810
01/24/19 09:37 PM
01/24/19 09:37 PM
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hemienvy Offline OP
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OK, I'm going by the wiring circuitry on the factory diagram,
although there is still no physical electrical connection
between the socket and the chassis.

It is possible that the actual wiring on the truck does not match
the diagram. I have not unwrapped the wiring to verify the circuit.


Another oddity is that the bulb that they call for, a little #94
push-in bulb, only has two connections (one filament), which
supposedly means there is only one circuit anyway.

Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2611834
01/24/19 10:46 PM
01/24/19 10:46 PM
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Doesn't care what this says anyway
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I don't know about trucks but on the cars of that era the side markers are either markers or blink not both. I never bothered paying attention to my truck to see what it does.

Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2612020
01/25/19 01:08 PM
01/25/19 01:08 PM

R
RWG75
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This came up recently in a conversation about converting to LEDs and the short answer is that ground for one function is through the lead for the other function.

A thing you may not have noticed yet: headlights off, the front turn sig and side marker blink in unison. Marker lights on and the turn sig and the marker alternate. The marker will come on when either lead is supplying 12v and will turn off when both leads supply 12v.

I haven't tried it but I think if you yank the turn sig and flasher relays, it should kill the front markers. As in: the front markers ground back through the turn sig circuit.

edit: dug up the thread, reply #3 explains the wiring

https://ramchargercentral.com/vehicle-help/led-side-marker-help/

Last edited by RWG75; 01/25/19 01:18 PM.
Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2612241
01/25/19 08:08 PM
01/25/19 08:08 PM
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Danny Offline
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my 78 and my 79 trucks fender markers do blink, my 70 challenger does not

Re: 1979 LiL Red truck electrical Q [Re: ] #2612324
01/25/19 11:01 PM
01/25/19 11:01 PM
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hemienvy Offline OP
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RWG75,
Thank you ever so much ! That's it.
If you were here I'd be buying your beer all night.

This is the kind of crap the auto makers do that is
so stupid it makes me mad.

Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2612384
01/26/19 01:12 AM
01/26/19 01:12 AM
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east side of Ohio
basketcase Offline
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the fender lights blink alternately with the turn signals in the grill. The marker part of the light does not stay lite, so no need for a bulb with two filaments.


Dave


1981 Dodge D150 360 auto
Re: 1979 LiL Red truck electrical Q [Re: hemienvy] #2612595
01/26/19 03:07 PM
01/26/19 03:07 PM
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Colorado
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Stroller Offline
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The bulb plugs into the socket. The socket pig tail plugs into the harness where it shares a common ground.


3 things a man should never borrow: Guns, another mans mopar or his wife.
Re: 1979 LiL Red truck electrical Q [Re: Stroller] #2612685
01/26/19 06:04 PM
01/26/19 06:04 PM
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hemienvy Offline OP
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Stroller,
I don't want to seem nitpicky, but I think what you wrote is incorrect. Neither incoming lead traces back to a ground in the harness. They
are both either +12V or off, but no ground. If the bulb sees +12V
on both sides of the filament, it will not light.
If I understand this anyway...

I'm considering trying to fit a socket to take a 2-filament 1157 bulb,
and also add a chassis ground. Then I'll have two complete independent
circuits. Much easier to diagnose problems.

Re: 1979 LiL Red truck electrical Q [Re: basketcase] #2612949
01/27/19 09:53 AM
01/27/19 09:53 AM
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Greenville, PA
redraptor Offline
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Originally Posted By basketcase
the fender lights blink alternately with the turn signals in the grill. The marker part of the light does not stay lite, so no need for a bulb with two filaments.


iagree So what's the issue?

Re: 1979 LiL Red truck electrical Q [Re: redraptor] #2612954
01/27/19 10:09 AM
01/27/19 10:09 AM
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Buford, GA
I_bleed_MOPAR Offline
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From his initial post I think he was just curious as to how the light worked with no ground circuit. work


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )






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