Question about Mercury Grand Marquis
You check with a test light all the connectors,the test light will light up when there is voltage present on that terminal,so check the input ,before you turn it on,then check the output after you turn it on,this is the best way to tell if the out put is working,and there is voltage getting to the switch.If this was at all helpful,please rate thank you.
Posted on Aug 24, 2010
Want it the easy way????
Get behind the headlight assembly remove the electrical connector to the headlight bulbs, may as well test both sides.... pick up a 12 volt DC test ligh,t attach the pin end into the power conector of the headlight plug and ground the "alligator" clip to a good known ground....turn on the high and low beams at the headlight switch....test light should light up on either high or low depending on which contact you are testing, if it lights up the switch is fine you will need a set of Halogen bulbs....be sure to NOT touch the glass bulb lenses with your hands as the oils on your fingers will prematurely burn out the bulbs in half there life span because they get so hot.
There are about three different brightness bulbs to buy let the auto parts person help you in this I chose the mid range its a step above factory brightness but better for night vision...the real hot ones are the "blue" so to speak bulbs... they are good but do blind on coming cars, buy em in two packs you save a bundle of cash that way and believe me if one is bad and the other is lit...you can rest assure the other one will be burning out real soon after the new one is installed, so why wait and be inconvienenced do it while you are replacing the one thats bad.
Posted on Aug 23, 2010
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Posted on Jan 02, 2017
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