Having problems with your Mercury Grand Marquis ?

The 15 amp fuse in slot 16 blows when the defrost is selected from the heating controls. No problem when heat is selected, but blow when either heat-defrost or just defrost is selected.

Posted / edited by AnonymousUser on : 30-11-2020

Answers :

Hi
Get\015\012a wiring diagram and start tracing the circuit(s) with an ohmsmeter.\015\012Between two point in the wiring should the meter read infinity. In\015\012order to test relays and such, they should usually be actuated while\015\012testing. While they are actuated, they should not read infinity.
Sound like you have a short it the defrost control switch,Just pull the controls out an take a look for burnt or frayed wires
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