97 grand marquis trunk problem

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94chevytruck

Member - Posts: 21

Joined: June 20, 2008

Location: Texas, United States

Posted: March 12, 2009 at 2:30 PM / IP Logged

Im in the process of installing a remote start alarm in a friends 97 grand marquis but am having a problem with the trunk solenoid. I wired up a relay between the output wire of the alarm and the trunk release wire.

its wired like this:

(-) alarm output - 85

purple / YELLOW trunk wire - 87

12 volt (+) from constant feed in ignition harness - 86, 30

everytime i try to activate it, the starter/alternator fuse blows. Should i take the 12(+) straight from the battery? I figured the ign. harness would be able to handle the draw of a stock trunk solenoid. Am i missing something here?

If it aint broke...fix it till it is!

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 12, 2009 at 4:16 PM / IP Logged

Is the purple / YELLOW positive going towards the trunk and if so does it sit on ground or nothing? Does it go straight to the solenoid which is then grounded on the other side? I would take a15amp fused permanent feed to 87 and 86 and take the output from . As it happens your relay set-up is correct, it's just everyone seems to take 30 as the output, although in your case 30 and 87 are interchangeable. One more thought place a diode across 85 and 86 with the band towards 86 (pos).

Mike M2

Platinum - Posts: 2,652

Joined: June 29, 2005

Location: United States

Posted: March 12, 2009 at 4:39 PM / IP Logged

Wasn't those old Crown Vic's 5 wire for the trunk pop? I think they were. You need to cut the purple / YELLOW and put the trunk side to 30. car side to 87a, 12volts to 87. This will stop 12volts from backfeeding to the car itself...

Mike M2

Tech Manager

CS Dealer Services

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 12, 2009 at 5:22 PM / IP Logged

Thanks Mike M2 that's what I was leading up to with my "sitting on ground" question, let's face it, I don't even know what a Grand Marquis is! Saab 900/9000 were the only others I can think of with a 5 wire, the question being why? It's so unecessary.

Chris Luongo

Platinum - Posts: 3,746

This member consistently provides reliable information

Joined: May 21, 2002

Location: Massachusetts, United States

Posted: March 12, 2009 at 5:56 PM / IP Logged

It probably has factory keyless entry. Does it have the keypad on the driver's door?

It should be like this:

85: trunk release output from alarm

86, 87: fused 12 volts

------cut car's factory trunk wire in half----

87a: "dashboard side" of trunk wire

30: "trunk side" of trunk wire

Mike M2

Platinum - Posts: 2,652

Joined: June 29, 2005

Location: United States

Posted: March 12, 2009 at 9:10 PM / IP Logged

Dunno why, some new cars are still this way like the Camry....

Mike M2

Tech Manager

CS Dealer Services

94chevytruck

Member - Posts: 21

Joined: June 20, 2008

Location: Texas, United States

Posted: March 16, 2009 at 10:56 AM / IP Logged

Thanks for the response. Ill try hooking it up like this and tell you how it worked out.

If it aint broke...fix it till it is!

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97 grand marquis trunk problem

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