HOW DO YOU INSTALL A ENGINE BLOCK HEATER IN A 2004 NISSAN QUEST WITH A 3.5 V-6 ENGINE?

Fuse 12 for the brake switch, but it covers a lot of other things as well that would be very noticeable.

Automatic Speed Control Device (ASCD) Brake Switch, Data Link Connector, Combination Meter, Heated Seat Relay, Park Neutral Position Switch, Display Unit, Steering Angle Sensor, Display Control Unit, Navi Control Unit, Back Door Control Unit, Sliding Door Control Unit RH/LH, Sonar Control Unit, Daytime Running Lights, Hands Free Telephone

Nissan Quest (V42; 2004-2009) fuses and relays

Fuse Box Diagrams https://fuse-box.info > nissan > nissan-quest-v42-2004...

Here you will find fuse box diagrams of Nissan Quest 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels inside the car ...

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They are on the engine block. Depending on the engine size, usually 2 or 3 on the side and 2 between engine and transmission right below each head.
If you have a timing belt and you noticed coolant leak from front of engine, it could be coming from the water pump inside the timing belt cover.

Here's the link and I'm sure you will get the solution of the problem https://www.reliable-store.com/products/2004-nissan-quest-service-repair-manual-instant-download

its on the back side of the engine head toward the firewall on the drivers side.

Nissan Quest 2004 Transmission Fuse Box/Block Circuit Breaker Diagram
http://www.carfusebox.com/nissan-quest-2004-transmission-fuse-boxblock-circuit-breaker-diagram/
manual
http://www.vadennissanservicecontracts.com/owners-manual/nissan/2004-Nissan-Quest.pdf
Page 215 from manual only headlight come on for daytime running lights

it depends on what kind you have, some are metal clamps, that not around one of the radiator hoses, and then gets plugged in, some may go in into the oil dipstick or I've even seen some that go into the oil dipstick reservoir

Most relays for most vehicles are in the fuse block in the engine compartment,

http://groups.yahoo.com/group/villagerquest/

Thermo housing bolts to block with opening going into engine block too. Crossover pipes connect to backside of thermo housing.

The camshaft sensor is located inside the distributor and is part of it, in order to replace it you must replace the distributor,to replace remove the dist cap. mark the location of the rotor,by marking where its pointing to, then mark the dist housing, so now theres a mark on the rotor and housing to show where rotor points, next mark the location of dist going into housing, mark the shaft and the block,because it spins in block this way you can line back up.next remove hold down bolt and pull out,mark the new dist in exacat same spots as the old so you can install back the same,you may have to put it in and pull it out until your marks are lined up,this way the timing will be dead on, when done you can check timing. good luck

Your 2004 Nissan Quest is most likely to be equipped with a 3.5L V-6 engine. This engine has 2 Cam (PHASE) sensors. One is located in the back of each cylinder head. You must remove your intake air duct to see them.