I have no power to the audio system. checked the fuse. they are ok. Removed the audio system and measured the voltage and there is no voltage at all. what could be the problem?

Don't think too complicated. You have already pointed out the problem. "Voltage rails +61.2V and -63.7V" The voltage different between +61.2V & -63.7V makes DC protection be triggered. The difference is -2.5V (61.2+(-63.7))V. When potential difference greater than 1V makes DC protection. You should CHECK THE POWER SUPPLY CONNECTED TO "AMPLIFIER SECTION" especially the "2 large capacitors with 12000uf 71V that is to measure their capacitances."
Remember to disconnect the power applied to amp
section when measure +V and -V. Why? This ensures the UNBALANCE VOLTAGE of +V and -V NOT due to amp section.
.

the problem must be on the mother board chips

Park neutral safety switch could be bad , also the shift interlock safety system .
Shift Interlock System A brake/shifter interlock system consists of the following:

• ignition switch (11572)
• brake pedal stoplight switch (13480)
• brake shift interlock module
• brake shift interlock solenoid assembly (attached to key interlock assembly)
• necessary wiring

On floor-shift vehicles, the ignition/shifter interlock cable (3F719):

• locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
• requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.

Condition Possible Source Action

• Shift Interlock System Does Not Release or Lock Properly

• Circuitry open/shorted.
• Blown fuse.
• Damaged stoplight switch.
• Damaged shift lock actuator.

• GO to Pinpoint Test A .

PINPOINT TEST A: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE OR LOCK PROPERLY A1 CHECK ELECTRON IGN FUSE

• Check Fuse 5 (5A) located in fuse junction panel.

Is fuse OK?
Yes No GO to A3 . GO to A2 . A2 CHECK FOR SHORT TO GROUND

• Turn ignition switch OFF.
• Remove Fuse 5 (5A).
• Disconnect shift-lock actuator connector C203 located to the right of steering column.
• Measure resistance of the Circuit 1003 (GY/Y) between the correct terminal of Fuse 5 (5A) and ground.

Is resistance greater than 10,000 ohms?
Yes No REPLACE Fuse 5 (5A). GO to A3 . SERVICE Circuit 1003 (GY/Y) wire between fuse junction panel and shift-lock actuator. A3 CHECK POWER SUPPLY FROM FUSE 5 (5A)

• Reinstall Fuse 5 (5A).
• Turn ignition switch to RUN.
• Measure voltage on Circuit 1003 (GY/Y) wire and ground.

Is voltage greater than 10 volts?
Yes No GO to A4 . SERVICE Circuit 1003 (GY/Y) wire between interior fuse panel and shift-lock actuator. A4 CHECK POWER SUPPLY FROM FUSE 28 (15A)

• Turn ignition switch OFF.
• Disconnect connector C2016.
• Turn ignition switch ON.
• Measure voltage on Circuit 10 (LG/R) and ground.

Is voltage B+?
Yes No GO to A5 . SERVICE Circuit 10 (LG/R) for open. RESTORE vehicle and RETEST system. A5 CHECK WIRE BETWEEN STOPLIGHT SWITCH AND SHIFT-LOCK ACTUATOR

• Turn ignition switch OFF.
• Disconnect shift-lock actuator connector C203.
• Apply brake pedal.
• Measure voltage on Circuit 810 (R/LG) wire and ground.

Is voltage greater than 10 volts with brake pedal applied and less than 1 volt with brake pedal released?
Yes No GO to A6 . SERVICE Circuit 810 (R/LG) wire between stoplight switch and shift-lock actuator. A6 CHECK SHIFT-LOCK ACTUATOR GROUND

• Measure resistance of Circuit 57 (BK) and ground.

Is resistance less than 5 ohms?
Yes No REPLACE shift-lock actuator. SERVICE BK wire.

Low beam ? high beam ? DRL - daytime running lamps ?

• The headlamps are on continuously

• Headlamp switch.
• Circuitry.
• Multifunction switch.
• DRL relay 2 (if equipped).
• DRL jumper (if equipped).
• Headlamp relay (if equipped).
• RAP module (if equipped).
• Light sensor amplifier (if equipped).

• GO to Pinpoint Test F .

F1 CHECK THE HIGH BEAM CIRCUIT FOR SHORT TO POWER
Pull CJB Fuse 16 (20A) - central junction box ,inside the vehicle ! Ignition on !

• Do the headlamps continue to illuminate?
• Yes GO to F2 .
  No - REINSTALL the fuse.GO to F12 .
• F2 CHECK CIRCUIT 12 (LG/BK), 160 (DB/WH), AND 161 (DG/OG) FOR SHORT TO POWER
• pull fuse's CJB Fuse 21 (10A) , CJB Fuse 22 (10A)
• Do the headlamps continue to illuminate?
• Yes - REPAIR circuit 12 (LG/BK), 161 (DG/OG), or 160 (DB/WH) as necessary. TEST the system for normal operation.
  
  No - REINSTALL the fuses. If equipped with daytime running lamps (DRL), GO to F3 .
  
  If not equipped with DRL, GO to F6 .
  
  
• YOU CAN FIND WIRING DIAGRAM AT

http://www.bbbind.com/free_tsb.html Do you know how to use a wiring diagram ? Videos on youtube .

F3 CHECK CIRCUIT 13 (RD/BK) FOR SHORT TO POWER
do you know how to do this test ?

pull the
DRL Relay 2

• Do the headlamps continue to illuminate?

Yes REPAIR circuit 13 (RD/BK). TEST the system for normal operation.

No GO to F4 .

• Do the headlamps continue to illuminate?

Yes REPAIR circuit 13 (RD/BK). TEST the system for normal operation.

No GO to F4 . F4 CHECK THE DRL RELAY 2 Carry out the relay test for the DRL relay 2; refer to Wiring Diagrams, Cell 149, Component Testing.

• Is the relay OK?

Yes GO to F5 .

No INSTALL a new DRL relay 2. TEST the system for normal operation. F5 CHECK CIRCUIT 1032 (WH/BK) FOR SHORT TO POWER Measure the voltage between DRL relay 2 pin 2, circuit 1032 (WH/BK), harness side, and ground.

• Is voltage present?

Yes REPAIR the circuit. TEST the system for normal operation.

No GO to F6 . F6 CHECK CIRCUIT 1033 (RD/YE) FOR SHORT TO POWER
Multifunction Switch C259
Measure the voltage between multifunction switch C259 pin 507, circuit 1033 (RD/YE), harness side, and ground.

• Is voltage present?

Yes If equipped with DRL, REPAIR circuit 1033 (RD/YE). If without DRL, REPAIR circuit 13 (RD/BK), circuit 1033 (RD/YE), or DRL jumper as necessary. TEST the system for normal operation.

No If equipped with autolamps, GO to F7 . If without auto lamps, GO to F11 . F7 CHECK THE HEADLAMP RELAY Carry out the relay test for the headlamp relay; refer to Wiring Diagrams, Cell 149, Component Testing.

• Is the relay OK?

Yes GO to F8 .

No INSTALL a new headlamp relay. TEST the system for normal operation. F8 CHECK CIRCUIT 7 (LG/YE) FOR SHORT TO POWER
Light Sensor Amplifier C216

Rap Module C257

Park Lamp Relay
Measure the voltage between headlamp relay pin 2, circuit 7 (LG/YE), harness side, and ground.

• Is voltage present?

Yes REPAIR the circuit. TEST the system for normal operation.

No GO to F9 . F9 CHECK THE HEADLAMPS FOR ILLUMINATION Check the headlamps for illumination.

• Are the headlamps illuminated?

Yes GO to F10 .

No CHECK the headlamps while reconnecting the RAP module and light sensor amplifier. INSTALL a new RAP module or light sensor amplifier as necessary. TEST the system for normal operation. F10 CHECK CIRCUIT 15 (RD/YE) FOR SHORT TO POWER Measure the voltage between multifunction switch C259 pin 15, circuit 15 (RD/YE), harness side, and ground.

• Is voltage present?

Yes REPAIR the circuit. TEST the system for normal operation.

No GO to F11 . F11 CHECK THE MULTIFUNCTION SWITCH Carry out the multifunction switch component test; refer to Wiring Diagrams, Cell 149, Component Testing.

• Is the multifunction switch OK?

Yes INSTALL a new headlamp switch; REFER to Lamp Switch-Headlamp . TEST the system for normal operation.

No INSTALL a new multifunction switch; REFER to Section 211-05 . TEST the system for normal operation. F12 CHECK CIRCUIT 632 (GY/OG) FOR SHORT TO POWER
Multifunction Switch C259
Measure the voltage between multifunction switch C259 pin 12, circuit 632 (GY/OG), harness side, and ground.

• Is voltage present?

Yes REPAIR the circuit. TEST the system for normal operation.

No INSTALL a new multifunction switch; REFER to Section 211-05 . TEST the system for normal operation.

get a t control board

Crank sensor ? Power an grounds for the VCM engine computer . CHECKED ALL THE FUSES 3X ,What's this ??? Five volt reference voltage circuit in VCM , Did you check this ? Do you know what the five volt ref. circuit is ?Is there B+ voltage to ICM - ignition control module ?
047 Engine Hard to Start or No Start Scan Data for Ignition
This is the easy way ,viewing scan data .

I would suggest to check AC outlet first where adaptor is pluged in,if Ok measure output voltage from adaptor to see if there is any (using any voltage multimeter with AC/DC)
Check label on adaptor shold be writen AC or DC output ,and value 3V,6,9,12,24,48 etc...
If adaptor is ok then problem is power jack mounted in to the speaker (cold solder joints' or damage)

Measure the voltage at the big wire on the altenator engine off, do you have power? Check in your distribution box under hood, find the two rows of fuses located inside the box on the outer edge, look at the outside row from front to rear the 4th fuse (# 11/ 20 AMP fuse), is for the altenator field, make sure this fuse is not blown, if it is good and you have battery power on the big wire at the altenator, then replace the altenator. Hope this helps, let me know.

Low voltage Tx actually OK. Restored vaporised circuit tracks on controller board, fuse and interior light globe. All working OK.

JL amps are somewhat sensitive to low voltage. Everything has to be perfect in the power supply feeding the amp. I'll assume that you have large enough wire. Check the owner's manual on the JL site. They likely recommend 4g or larger. You need to measure the voltage across the B+ and ground terminals of the amp. If it's dropping below ~11v when you turn the volume up, you need to determine why. Make the same measurements at the battery terminals. If there is significantly less voltage drop there when the volume is increased, check all of the points in the circuit where there could be a bad connection. Look for corrosion, over-heated connection on fuses or at the battery and make sure the fuse is in good physical condition. Some types tend to overheat and melt. If everything looks OK, begin measuring the voltage at each point where there is any sort of connector. If for example, you get a significant difference in the voltage on each side of the fuse, the fuse, the holder or the connections to the holder may be defective.