Finding The 12V Switched Ignition Wire; Obtaining Constant 12V - Python 950 Installation Manual

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We recommend two possible sources for 12V constant: The (+) terminal of the battery, or the constant 12V supply

to the ignition switch. Always install a fuse within 12 inches of this connection. If the fuse will also be power-

ing other circuits, such as door locks, a power window module, or a Nite-Lite® headlight control system, fuse

accordingly.

IMPORTANT! Do not remove the fuse holder on the red wire. It ensures that the control module has

its own fuse, of the proper value, regardless of how many accessories are added to the main power

feed.

finding the 12V switched ignition wire

The ignition wire is powered when the key is in the run or start position. This is because the ignition wire powers

the ignition system (spark plugs, coil) as well as the fuel delivery system (fuel pump, fuel injection computer).

Accessory wires lose power when the key is in the start position to make more current available to the starter motor.

How to find (+)12V ignition with your multimeter:

1. Set to DCV or DC voltage (12V or 20V is fine).

2. Attach the (-) probe of the meter to chassis ground.

3. Probe the wire you suspect of being the ignition wire. The steering

column harness or ignition switch harness is an excellent place to find

this wire.

4. Turn the ignition key switch to the run position. If your meter reads

(+)12V, go to the next step. If it does not read (+)12V, probe another wire.

5. Now turn the key to the start position. The meter display should stay steady, not dropping by more than a

few tenths of a volt. If it drops close to or all the way to zero, go back to Step 3. If it stays steady at (+)12V,

you have found an ignition wire.

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