What is the correct voltage from relay to inertia switch. I have 12+ volts into relay, and 6.4 volta to inertia swith and pump. Is that enough volts to run pump?


Asked by Dec 05, 2015 at 11:41 AM about the 2001 Mercury Grand Marquis LS

Question type: Maintenance & Repair

engine cranks-no start. Spark test good. runs on carb cleaner. Low voltage
from relay.

2 Answers


I doubt it. Replace that relay!


Turns out the (bad) fuel pump ground was causing the drop in voltage. I replaced the pump by jacking the diff up as high as I could, and then placing jack stands under the frame and then dropping the diff. This created plenty of room the remove the fuel sending unit. I cut the 3 wires for the gauge at unequal length and the soldered and heat shrink sealed after installing the new pump. Entire job took about 1-1 and half hours.

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,830
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,440
View All

Related Models For Sale

Used Ford Crown Victoria"
11 Great Deals out of 1,654 listings starting at $1,950
Used Lincoln Town Car"
49 Great Deals out of 2,364 listings starting at $1,542
Used Chevrolet Impala"
937 Great Deals out of 35,696 listings starting at $1,500
Used Cadillac DeVille"
2,379 listings starting at $1,495
Used Ford F-150"
3,272 Great Deals out of 216,647 listings starting at $1,500
Used Honda Accord"
1,265 Great Deals out of 78,694 listings starting at $1,400
Used Ford Taurus"
362 Great Deals out of 23,104 listings starting at $1,400
Used Ford Mustang"
739 Great Deals out of 41,066 listings starting at $900
Used Toyota Camry"
1,604 Great Deals out of 98,372 listings starting at $895
Used Chevrolet Tahoe"
1,076 Great Deals out of 36,074 listings starting at $1,700

Used Cars For Sale

2010 Mercury Grand Marquis LS For Sale
7 Great Deals out of 117 listings starting at $3,299
2009 Mercury Grand Marquis LS For Sale
5 Great Deals out of 118 listings starting at $2,995
2008 Mercury Grand Marquis LS For Sale
4 Great Deals out of 135 listings starting at $2,900