| Front parking and side markers not working, turn signals work [message #281591] |
Mon, 06 July 2015 20:34  |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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I am having trouble tracing this... even looking at the schematic. My clearance lights work up top, and rear marker and tail lights work fine. All turn signals and emergency flashers work as expected. But, my front parking lamps (below headlight) and orange side marker lamps do not work. Would this be a bad flasher even though it works when flashing?
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: Front parking and side markers not working, turn signals work [message #281593 is a reply to message #281591] |
Mon, 06 July 2015 20:53  |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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The turn signal filaments can still flash when the ground for the light assembly is broken because it can get a partial ground through the parking light filament back into all of the other lights and their grounds. This will happen when the parking lights are OFF and the wiring from the switch is good. When the parking lights are on and the wiring from the switch is good and the ground is bad, the bulb may not fully flash (doesn't go fully dark) even though the turn signal is working (flashing)elsewhere in the vehicle.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Front parking and side markers not working, turn signals work [message #281595 is a reply to message #281594] |
Mon, 06 July 2015 21:17 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
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Thanks Terry... I have wired a direct ground the the bulb and it doesn't help. The turn signal blinks bright, and turns off completely whether the parking lights are on or off. Still poking around. Bulkhead connector still has the factory labels hanging on and looks pristine for a 40 year old coach. From there it looks to go directly to the light switch.
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: Front parking and side markers not working, turn signals work [message #281606 is a reply to message #281604] |
Mon, 06 July 2015 23:18 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Brown should have voltage on it when the parking lights are ON. It will register a ground on an ohmmeter when the parking lights are OFF due to the other bulbs connected to it in the circuit which are hopefully grounded well. The brown also supplies power to the side marker, right from the front light socket, but the marker light ground is not connected directly to ground. IIRC that is a blue wire. It is connected to the turn signal circuit so the marker flashes opposite the front turn signal. The marker light gets its ground through the turn signal filament until the turn signal wire turns ON, at which time the marker now has 2 positive leads if the parking lights are on, and it blinks OFF while the front turn signal light is ON.
The turn signal is just a flashing power supply connected by the mechanical switch in the steering column. Usually powered by a separate fuse than the parking lights. Check your brown wire all the way back to the bulkhead connector if you have to, because that is what powers the parking lights in GM, and make sure you can light the lights by putting power on the brown wire right at the bulb socket.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Front parking and side markers not working, turn signals work [message #281612 is a reply to message #281606] |
Tue, 07 July 2015 01:33 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Read here
http://gmcmotorhome.info/chassis.html#MARKER
On Monday, July 6, 2015, Terry wrote:
> Brown should have voltage on it when the parking lights are ON. It will
> register a ground on an ohmmeter when the parking lights are OFF due to the
> other bulbs connected to it in the circuit which are hopefully grounded
> well. The brown also supplies power to the side marker, right from the front
> light socket, but the marker light ground is not connected directly to
> ground. IIRC that is a blue wire. It is connected to the turn signal
> circuit so
> the marker flashes opposite the front turn signal. The marker light gets
> its ground through the turn signal filament until the turn signal wire turns
> ON, at which time the marker now has 2 positive leads if the parking
> lights are on, and it blinks OFF while the front turn signal light is ON.
>
> The turn signal is just a flashing power supply connected by the
> mechanical switch in the steering column. Usually powered by a separate
> fuse than the
> parking lights. Check your brown wire all the way back to the bulkhead
> connector if you have to, because that is what powers the parking lights in
> GM,
> and make sure you can light the lights by putting power on the brown wire
> right at the bulb socket.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Front parking and side markers not working, turn signals work [message #281614 is a reply to message #281598] |
Tue, 07 July 2015 03:28 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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You need to find pin BV in the bulkhead connector and probe there for +12 with the parking lights on. If there is no voltage there then inspect purple the wires on both sides for an open connection. After that back up to the purple wire on the light switch pin 4.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Front parking and side markers not working, turn signals work [message #281778 is a reply to message #281614] |
Thu, 09 July 2015 18:16 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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Thanks Terry and Gene, I now have all exterior lights working. The purple wire was simply unplugged from the interior side of the bulkhead connector. There is no room to work in there. The wires are so tight to the harness that it is almost impossible to move the fuse box away to get in to see the plugs. I was able to get it with needle nose pliers.
Off camping this weekend.
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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| Re: Front parking and side markers not working, turn signals work [message #281779 is a reply to message #281778] |
Thu, 09 July 2015 18:20 |
Mike Teets
Messages: 299
Registered: January 2004
Location: Dublin, OH
Karma: 0
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Senior Member |
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And Ken...
Quote:Thanks Terry and Gene, I now have all exterior lights working. The purple wire was simply unplugged from the interior side of the bulkhead connector. There is no room to work in there. The wires are so tight to the harness that it is almost impossible to move the fuse box away to get in to see the plugs. I was able to get it with needle nose pliers.
Off camping this weekend.
Mike, GMCing since 2002
77 Palm Beach, 260, 403
Dublin, OH
http://teamteets.com/gmc/
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