How come it blows 30 amp atc fuse instantly even with the system off

There is an actuator motor located on the transfer case. It selects range; hi neutral and lo and engages the front differential. There is a second clutch actuator motor on the front differential that engages the front wheel hubs.

You will need to disconnect both motors to eliminate electronics. It could also be you have an abraided wire to either the transfer case or the front differential. If unplugging both actuators doesnt stop fuse blow, you will need to test for signal or power to ground shorts.

Free (with ads) schematics are available using the "carmin std" app.

Sorry but an ATC fuse is a blade style fuse. They are larger than ATM fuses and found in many later model vehicles. Please write back and specify which ATC fuse it is that keeps blowing. It should be related to the ECM, ignition system or fuel system. If there are any other details please include that information as well. Any recent work or repairs performed. Besides scanning for codes. Was there anything strange that you noticed? Anything that isn't powering up or functioning normal?

ATC fuse 20 amp ? Power to the ATC control module & encoder motor . Shorted circuit in electrical wiring to one of the componets listed above . Do you know what a electrical diagram is ? How to use a DMM - digital multi-meter to test electrical circuits ? Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info year , make , model an engine size. Under system click on driveline / axle . Under subsystem click on transfer case controls . Click the search button ,then the blue link. First link / first diagram ,top right . ATC fuse - orange wire to encoder motor an atc control module . One of these has a short to ground probably .

Fuse is for the fan ?

this is for the base model

FUSE PANEL IDENTIFICATION (1983-90 LINCOLN TOWN CAR) The fuse panel is located in the instrument panel to the left of the steering column. To expose fuse panel, remove lower steering column finish panel.

Fuse & Circuit Breaker Identification

· 1 - 15 Amp Stoplights, Hazard Warning Lights, Speed Control Module, Trailer Tow Relays, Cornering Light Relay (1983-89)
· 2 - 8.25 Amp (Circuit Breaker) Windshield Wiper/Washer
· 3 - Blank
· 4 - 15 Amp Taillights, Side Marker, License Light, Parking & Coach Lights, Cluster Illumination, Trailer Tow Relay
· 5 - 15 Amp Turn Signal & Back-Up Lights, Trailer Tow Relay, Cornering Light Relays, Heated Rear Window Relay, Rear Defrost (1988-90), A/C Clutch & ATC Module (1990), Load Leveling (1990)
· 6 - 20 Amp Heated Rear Window Control, Speed Control Module & Clock Display, Illuminated Entry Module, Power Window & Police Accy Relays, Fuel Filler Door Release (1983-87), A/C Clutch & Cornering Lights (1983-89), Deck Lid Release (1987-90), Tripminder
· 7 - 10 Amp Daytime Running Light Resistor (1990)
· 8 - 15 Amp Dome LP-Clock, Key Warning Chimes & Electric Mirrors, Courtesy & Visor Mirror Lights, Autolight & Illuminated Entry Modules, Tripminder, Electronic Radio Memory, Trunk & Underhood Lights
· 9 - 15/30 Amp Heater Blower (15 Amp), AC/ATC Blower (30 Amp)
· 10 - Blank
· 11 - 20 Amp Radio & Power Antenna, CB Radio
· 12 - 20 Amp Door Cigarette Lighters, Power Seats & Door Locks (30 Amp), Tailgate Power Window (1983-89)
· 13 - 5 Amp Illuminated Outside Thermometer, Instrument Panel Lights
· 14 - 20/25 Amp (Circuit Breaker) Flash-To-Pass, Sun Roof, Power Windows
· 15 - 10 Amp Taillights, Parking, Side Marker/Coach, License Lights
· 16 - 20 Amp Horn & Front Cigarette Lighter
· 17 - 15 Amp Electronic Cluster, Message Center
· 18 - 10 Amp Warning Indicator Lights, Throttle Solenoid Positioner, Low Fuel Module & Autolight System, Dual Timer Buzzer & Electronic Chimes, Electronic Message Center

Fuses only blow when the current is above the limit. Tripping a 20 amp fuse is a serous current, probably caused by a shortage. Check if an animal has eaten on your cables, or perhaps a cable lost its isolation and is now connected to the plating. Use a ohm meter and try to follow the cable from the fuse to in the car, till toy see something.

What you have done? You Just damage the TCCM and that's why you will not manage to shift 4x4. Why this happened? Because you had shortage somewhere and you receive blown ATC fuse.You put a bigger fuse in capacity where the was stronger to blown and the fault moved to the tccm system which was not protected and blown.Ask for an expert to check and see whether the fault is easy to get fixed.

the fuse is blowing because there is a short circuit somewhere in the system,,, to help you further I will need to know what fuse it is that is blowing AND what is it that you are doing WHEN the fuse blows ??? what is the Amp rating of the fuse that is blowing ? and in the owners manual ( under FUSES ) what Amp rating does it call for ??
write me back with this info and I will do my best to walk you thru the next steps to solve this problem.
thanks,

c...

is it the crank fuse if it is could be starter drawing to many amps try new starter

You say it eventually allows you to put new fuse in, do you mean when it sits for a while, a new fuse won't blow, but if it blows and you immediately replace it, it blows again instantly?