Ultra Tune Version 3 Instruction Manual

ultratune power probe

Ultra tune Intelli Probe is all the same as Version 1 except for the added switch.



Version 3 has two switches. The addition of a second switch (Load) expands the Power Probe functionality and makes it even safer and smarter to work with electrical and electronic circuits. As in versions 1 and 2 above, the left switch (7) is still used to select Positive or Negative Output to the probe Tip in relation to the vehicle battery.

The additional new Load Switch (on the right of switch (7) is used to provide limited current output to the test tip when in OFF position, and full current output when in ON position. When the Load switch is in ON position the operation of the Power Probe is exactly the same as in version 1 and 2 described above.

When the Load Switch is in OFF position the current provided to the probe’s test tip in inject mode is limited greatly in order to prevent damaging sensitive electronic components.

When injecting current in this mode to for example a relay or a light bulb, the bulb will not light-up but it will give an indication on the probe’s Polarity and Overload LED’s, combined with a continuous audible warning sound.


If a small bulb is connected on one side to ground (negative) and you are trying to inject positive on its other terminal, switch (7) must be in position I (positive inject) and the second switch “Load” (on the right side) in OFF position.   The Polarity LED should now be illuminated RED.

Touch the Tip of the probe to the bulb’s terminal. The bulb won’t light-up fully if at all.

Observe that the Polarity LED (6) has changed to GREEN indicating that you now have negative current incoming (through the bulb’s filament).

At the same time a warning sound will be emitted and the Overload LED(5) will light-up.

Depending on the device you’re testing the warning sound will vary between loud (heavy current draw devices) down to muted for small current drawing devices.

A very loud sound with brightly lit Overload LED indicates that you may have connected to a device with very heavy current draw or straight to a power line with current polarity opposite from the one you are injecting. Double check and be careful before injecting full current into the circuit. When you have established that you can not damage anything you are testing, switch the Load Switch to ON position. In the example above, the bulb will now light-up as you have full positive power on the tip of the probe.

In general, if the warning sound is weak and the two LED’s are not brightly lit, the device or circuit under test has high resistance and it is safer to inject full power.

In essence, the combination between the Polarity LED (6), Overload LED (5) and Sound gives you an indication that the device you are about to inject power into is connected to a current source with opposite direction. It also gives you a good indication how ‘heavy’ in current draw terms this device might be. Careful observation of those three indicators is crucial for taking full advantage of the probe’s capabilities. Little practice and logical thinking go a long way to mastering this wonderful tool and its multitudes of use.