wiring info 91 mercury grand marquis

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=31054
Printed Date: July 02, 2025 at 4:23 PM

Topic: wiring info 91 mercury grand marquis

Posted By: mikej9881
Subject: wiring info 91 mercury grand marquis
Date Posted: April 26, 2004 at 11:12 AM

i was just wondering, b4 i instll my remote starter are there more than 1 ignition and starter wires on my 91 mercury grand marquis. ive read that if there are you have to use all to make sure the starter disable and remote start work properly. ive already checked it out on the website and it only lists one of each but i think i remember checkin a while back and it had more than one ignition wire listed. any help would be appreciated

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mike

Replies:

Posted By: ers1121
Date Posted: April 26, 2004 at 6:30 PM

https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1990-91&make=Mercury&model=Grand%20Marquis&ID=18392&type=Alarm

Hope this helps

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Ed

Posted By: mikej9881
Date Posted: April 26, 2004 at 9:10 PM

yea i saw that already just wondering if there were 2 ignition wires??

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mike

Posted By: Velocity Motors
Date Posted: April 27, 2004 at 8:53 AM

Just one ignition wire but there are two primary ACC wires ( GREEN/ YELLOW ) but only one needs to be powered up.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: mikej9881
Date Posted: April 27, 2004 at 9:45 PM

im hooking up the starter disable and remote start from the phoenix digital pd 175. i was wondering should i hook up the ignition wire from the remote start relay b4 or after the starter disable relay. the manual is not clear and it says that the alarm stays on while starting so any help would be much appreciated.

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mike

Posted By: boomer_106
Date Posted: April 27, 2004 at 9:57 PM

Your going to need to hook the remote start wire to the starter side of the wire you have cut for the starter kill so the starter can be energized.

Posted By: mikej9881
Date Posted: April 28, 2004 at 9:20 AM

i have a pheonix digital pd 175. its tachless and i have to hook the red wire somewhere it gets 12 volts only when the engine is runnin. i know i can hook it to the oil lamp in the dash but im not sure which side to hook it. on one side its hot when the ignition is on. on the other when the bulb is out its not nor is it when its running. so can anyone tell me how to test it to connect it properly or any other place to hook it would be great.

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mike

Posted By: robbie2883
Date Posted: April 28, 2004 at 11:04 AM

hook it to the 12 volts when engine is on....what happens is the RS reads the 12 volts on the wire and decides to stop turning the starter by that

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if its jammed force it - if it breaks in the process it needed to be fixed anyway
posted_image

Posted By: mikej9881
Date Posted: April 28, 2004 at 11:17 AM

could i hook this up like a tach wire?? or where else is there a wire that gets 12v+ only when engine is running?

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mike

Posted By: mikej9881
Date Posted: April 28, 2004 at 5:43 PM

ive got my remote start hooked up and working. i wanted it to turn on the air conditoner but i can find the right wire. ive tried all wires possible. does this mean i need to power to acc. wires? and if so will i need a relay?

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mike

Posted By: eurotech
Date Posted: April 28, 2004 at 6:21 PM

I need to know what car you have

Posted By: mikej9881
Date Posted: April 28, 2004 at 6:32 PM

its a 91 mercury grand marquis and there is only 1 acc. wire listed on this site. that cant be right though bcuz i tried all the wires 1at a time which came on when ignition was in on position. i turn the key on and the blower works.

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mike

Posted By: mikej9881
Date Posted: April 28, 2004 at 6:36 PM

i have a positive signal for a trunk release coming of my alarm .and believe my car uses a positive signal to pop trunk. its a 91 mercury grand marquis question is should i use a relay? there isnt one being used in the instructions and it came with all other needed relays.

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mike

Posted By: eurotech
Date Posted: April 28, 2004 at 6:37 PM

is there 2 grey yellow wires at your ign harness? if so, try powering them both up

Posted By: eurotech
Date Posted: April 28, 2004 at 6:40 PM

if it is a full 12v signal then you should be able to hook right in to it

Posted By: mikej9881
Date Posted: April 28, 2004 at 8:41 PM

yes actually there may be 3

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mike

Posted By: mikej9881
Date Posted: April 28, 2004 at 8:41 PM

yes actually there may be 3 and can i use the 1 acc. power wire from the remote start relay for both

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mike

Posted By: profuse007
Date Posted: April 29, 2004 at 12:15 AM

what kind of alarm unit is this?

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: mikej9881
Date Posted: April 29, 2004 at 10:36 AM

phoenix digital 2 way pd-175

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mike

Posted By: mikej9881
Date Posted: April 29, 2004 at 10:49 AM

the color code chart on this site is somewhat wrong. i have a phoenix digital 2 way . it came with a 3 pack prewired relay for the remote start. i got it starting fine but need help gettin the a/c to come on. the ign. relay has one wire for the power to ign. same as the acc. relay. heres the proper vehicle wiring info i believe. i have the ign. wire to the red light green and i need to hook up the acc wire to BLACK/ green. so how do i hook up all the other ign. wires needed?

Mercury

Grand Marquis

1990-1991

Remote Starter Wiring Colors and Notes
Function	Vehicle Color	Location
Start:	WHITE/ PINK	IGNITION SWITCH HARNESS
Ignition #1:	RED / LIGHT GREEN	IGNITION SWITCH HARNESS
Ignition #2:	BROWN / PINK	IGNITION SWITCH HARNESS **
Ignition #3:	GRAY / YELLOW-2WIRES	IGNITION SWITCH HARNESS **
Accessory:	BLACK/ LIGHT GREEN	IGNITION SWITCH HARNESS
Brake Light:	LIGHT GREEN (+)	AT SWITCH ABOVE BRAKE PEDAL
Tach Signal:	DARK GREEN/ YELLOW '#	TAN / YELLOW ' # AT COIL *

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mike

Posted By: mikej9881
Date Posted: April 29, 2004 at 10:54 AM

actually there are 4 ignition wires and one acc. heres what i found and it matches my harness. im tryin to get the a/c to come on with remote start. have to power more ign wires not sur wich ones

Mercury

Grand Marquis

1990-1991

Remote Starter Wiring Colors and Notes
Function	Vehicle Color	Location
Start:	WHITE/ PINK	IGNITION SWITCH HARNESS
Ignition #1:	RED / LIGHT GREEN	IGNITION SWITCH HARNESS
Ignition #2:	BROWN / PINK	IGNITION SWITCH HARNESS **
Ignition #3:	GRAY / YELLOW-2WIRES	IGNITION SWITCH HARNESS **
Accessory:	BLACK/ LIGHT GREEN	IGNITION SWITCH HARNESS
Brake Light:	LIGHT GREEN (+)	AT SWITCH ABOVE BRAKE PEDAL
Tach Signal:	DARK GREEN/ YELLOW '#	TAN / YELLOW ' # AT COIL *






	.

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mike

Posted By: mikej9881
Date Posted: April 29, 2004 at 6:08 PM

never mind got it all figured out works great

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mike