Fuse Link
Fuse links are provided in the charging system to prevent damage to the harness and alternator in case the harness becomes grounded or a booster battery is connected with reverse polarity. Insulation which is rippled or bubbled indicates that the link is blown and must be replaced. In case of vehicles with two fuse links, check the accessories link by turning headlamps or an accessory on. If fuses are not blown and they still fail to function, the link is probably blown and must be replaced.