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

1,215

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 5,340
#2 kbro
kbro
Reputation 2,050
#3 Js08016
Js08016
Reputation 1,710
View All

Related Models For Sale

Used Ford Crown Victoria
13 Great Deals out of 1,056 listings starting at $2,225
Used Lincoln Town Car
27 Great Deals out of 1,835 listings starting at $600
Used Chevrolet Impala
524 Great Deals out of 29,491 listings starting at $799
Used Lincoln Continental
4,170 listings starting at $41,448
Used Cadillac DeVille
10 Great Deals out of 1,622 listings starting at $1,499
Used Ford Mustang
371 Great Deals out of 46,946 listings starting at $1,999
Used Ford Taurus
231 Great Deals out of 20,268 listings starting at $1,200
Used Ford F-150
2,234 Great Deals out of 208,521 listings starting at $1,499
Used Chevrolet Tahoe
567 Great Deals out of 27,373 listings starting at $1,500
Used Honda Accord
758 Great Deals out of 87,630 listings starting at $1,250

Used Cars For Sale

2010 Mercury Grand Marquis LS For Sale
88 listings starting at $2,495
2009 Mercury Grand Marquis LS For Sale
6 Great Deals out of 98 listings starting at $4,000
2008 Mercury Grand Marquis LS For Sale
4 Great Deals out of 102 listings starting at $2,250