Do not reverse the battery lead connections. This will burn out the diodes on the electrical parts.
Always check battery condition before condemning other parts of an electrical system A fully charged battery is a must for conducting accurate electrical system tests.
The electrical parts should never be struck sharply, as with a hammer, or allowed to fall on a hard surface. Such a shock to the parts can damage them.
To prevent damage to electrical parts, do not disconnect the battery leads or any other electrical connections when the ignition switch is on, or while the engine is running.
Because of the large amount of current, never keep the starter button pushed when the starter motor will not turn over, or the current may burn out the starter motor windings.
Do not use a meter illumination bulb rated for other than voltage or wattage specified in the wiring diagram, as the meter or gauge panel could be warped by excessive heat radiated from the bulb.
Take care not to short the leads that are directly connected to the battery positive (+) terminal to the chassis ground.
Troubles may involve one or in some cases all items.
Never replace a defective part without determining what CAUSED the failure. If the failure was caused by some other item or items, they must be repaired or replaced, or the new replacement will soon fail again.
Make sure all connectors in the circuit are clean and tight, and examine wires for signs of burning, fraying, etc. Poor wires and bad connections will affect electrical system operation.
Measure coil and winding resistance when the part is cold (at room temperature).
Color codes
| BK | Black | G | Green | P | Pink |
| BL | Blue | GY | Gray | PU | Purple |
| BR | Brown | LB | Light blue | R | Red |
| CH | Chocolate | LG | Light green | W | White |
| DG | Dark green | O | Orange | Y | Yellow |
Electrical connectors
Female connectors [A] | 
Male connectors [B] |