When I turn the switch on to start the truck, the fuse #20 in the instrument panel fuse box, blows. The diagram says it is the transmission. It caused the check gauges light to come on and to stop the transmission from shifting into first gear when it is in drive. I called the mechanic who recently rebuilt the transmission to see if he had any ideas, he told me it was probably the downshift solenoid. After I replaced the solenoid it didn't fix the problem. Any ideas?
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Testing the electrical circuit before replacing parts is how it's suppose to be done . The blower doesn't work at any speed ? Did you check A/C FAN fuse 20 amp in the left instrument panel fuse box ? Blower Motor Problems Auto Repair Help
Impossible to tell without knowing what fuse number is blowing, along with some basic electrical troubleshooting.
Common suspects include:
altered factory stereo
Aftermarket alarm system
defective instrument lamp
defective instrument panel
In some Jeeps the fuse controls the transmission control relay in the power distribution box. Replace the fuse. If it blows again, there could be a short in the power distribution box or the writing between the power box and the control module.
12V power passes through 15A fuse 33 (the one that keeps blowing?) in the battery junction box and on to the main light switch. When the main light switch is set to PARK, 12 volts is routed via the BRN lead to the park filaments of the dual park/turn lamps. These lights remain on when the headlight switch is turned to HEAD.
The main light switch gets its 12V input from 7.5A fuse 11 in the central junction box and the same 15A fuse (33) identified above. When the main light switch is set to PARK, 12 volts is routed via the BRN lead to the instrument panel dimming module and module output is applied to the panel illuminating lamps.These lights remain on when the headlight switch is turned to HEAD.
The input to fuse 33 is hot all the time so should read 12V. If you read 12V at the TAN/WHT connection with the fuse out, something is definitely not right. I'm sure you have noted that the fuse is common to the non-functioning circuits you mentioned.
Have you checked your fuse? If not you can look in the fuse box located under the right-hand side of the instrument
panel. Remove the trim panel and fuse box cover to access the fuses. The fuse you are looking for is a 5 amp fuse and is in the number 3 position in the box (along the bottom row see diagram below). This fuse also covers the memory seats & pedals. This may be your problem but there may have been a reason it blew if it did blow and then you are looking and more work into the reason it is blowing if it continues to blow. I hope this helped and good luck.
The headlight switch has a rheostat built into it to dim your dash lights, it may have shorted out. As soon as you turn on the switch this rheostat comes into play and is probably whats blowing the fuse. I think if you replace the headlight switch, it will solve your problems.
relays are normally in the fuse panel on the left side of dash by knee.
Fuses and Circuit Breakers
Location and Values NOTE: The headlamp switch (11654) has an integral 20-amp circuit breaker.
The combination instrument panel fuse and circuit breaker panel contains most of the fuses and circuit breakers used in the system.
The fuses and circuit breakers are color-coded by amp rating.
The locations and values of the fuses and circuit breakers not contained in the panels are shown in the following chart.
Circuit Protection and Rating
Headlamps and High Beam Indicator
20 Amp. CB
Integral with Lighting Switch
Heated Back Window
16 GA Fuse Link
Power Windows, Power Seat, Power Door Locks
20 Amp. CB
Starter Motor Relay
Engine Compartment Lamp
25 Amp. CB
Lower Instrument Panel-Reinforcement
The fuse block is located below the left side of the instrument panel on 1973-88 trucks. In addition, the radio is protected by a separate fuse located in the wire between the radio and the fuse block.
If a fuse should blow, turn off the ignition switch and also the circuit involved. Replace the fuse with one of the same amperage rating, and turn on the switches. If the new fuse immediately blows out, the circuit should be tested for shorts, broken insulation, or loose connections.