electrical

Alternators

Submitted by djblade311 on Thu, 12/26/2013 - 23:26

Alternator Comparison by "5-90"

  • At idle, alternators normally spin at 2400rpm
  • Engine RPM of 2K is usually where alternators are at maximum output
  • YJs and TJs have smaller alternators than XJs

pre-99 XJs

  • Used P&P field voltage connectors

99-01 XJ Alternator:

Part # 56041822AA
110 or 117 Amps
 

Vehicle Speed Sensors

Submitted by djblade311 on Sun, 03/25/2012 - 12:51

By default, the 1999 XJ uses an electrical speedo gear.   The speedo gear is still mechanical but sends an electrical signal to the PCM.
Troubleshooting
If your speedometer is acting on the fritz, likely the VSS (Vehicle Speed Sensor) needs replacement.   
JB SuperShort SYE