Hope one of you lovelly people can help me with a few problems I'm having,

one minute its charging @13.8 volts and all is well next minute batt light is on it dont charge revconter stops workin temp gauge gives up I'm thinkin this is a multi-plug some where pls HELP

Tis a 89 saff btw

please please please heeeeeeeeelllllllllppp its really pissin me right off