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Thats correct with Blower commanded on there should be 12vlts constantly,it is the ground that is varied,so yo need to measure your ground with the blower commanded on,use you meter have one connection attatached to body ground measure the middle wire you should measure 0 vlts to no more that 2 volts,if you do and the blower still does not operate a new blower is the solution
first check the heater fuse...then you want to unplug the fan motor lead and run it straight to the battery...if it works then you will need to check the resistor assembly..it is located on the heater housing right near the fan..it controls the different speeds for the fan and usually has 4-6 wires coming off it. If these don't fix the problem...try looking in the fuse/relay box both in the cab and under hood to see if you have a relay for the heater fan...as it may be defective
Resistor blown in heater. Follow the wires from the heater motor ( in foot well ) to a plug in the ducting between the fan and main heater body in centre of car. Unplug and remove the plate , it should be held in by a couple of screws. The plate should have a couple of wire coils of which , a couple will be broken. Replace resistor and heater should work. Happy heating Marshall
Horn and heater may be fuse related. The headrests have nothing to do with fuses. The switch is bad or going that way for the seat or the motors for the headrests are out.
The horn fuse spin it, or replace as corrosion from aluminum fuses cause problems. I suggest replacing them all with new copper barrel fuses. The blower motor fan is a strip fuse on the driver side strut mount in a tootsie roll sized case.
Aside from the obvious fuse or relay in power supply, it could be the blower switch, resistor pack usually located in heater box that contols speed, or the blower motor itself. Unplug wires to blower and measure batt. voltage with switch on. If voltage present, use ohmmeter to test blower resistance. No resistance, motor burned out. Check wiring for a cut/brake in circuit.
locate your blower motor.probably under dash rh side, possibly under hood fire wall area pass. side. unplug connector to blower motor.if older style with one wire check for source voltage present at wire, source voltage meaning voltage present at connector should equal batt. voltage.if connector has 2 wires place multimeter on DC volts across both terminals and reading should equal source with fan switch on high.
please check the resistor block. this is the part that controls the speed of the fan motor. it is usually found in the blower housing or in the evaporator housing. it has 4-5 wires on it and the last big blue wire normally goes straight to the blower motor. there should be resistance on all pins of the resistor block.