One for each led bulb resolves after glow when led bulbs is supposed tro shut off.

The equalizer must be spliced across the - ground wire and the + wire feeding to each led bulb.

One for each side marker or headlight resolves bulb-out warning problems.

The equalizer must be spliced across the - ground wire and the + wire feeding to original light bulb.

Two in front and two in rear required, or one for each led turn signal bulb.

For turn signal led bulbs, the equalizer must be spliced across the - ground wire and the + turn signal wire feeding each led bulb.