My '85 FJ60 brake warning light stays on. It is dimmer then when e-brake is engaged, but visible. Checked brake resovoir float switch and found no short, and switch operates correctly. Checked parking brake switch and switch is not shorted and operates correctly. Only other possibility in this brake warning light circuit is a diode (according to wire diagram) that goes back to neg. side of ignition coil, but diode wire colors don't match up- Any help would be appreciated on where to locate this specific diode.