Date registered: Dec 2008
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
1988 420 sel charging issues
I have a 1988 420 that intermittently will not charge the battery. I replaced the alternator, regulator and the battery. The battery light on the dash has never come on. It also does not come on when the key is tuned to the run position (the lights next to it do not come on either). Checked the lamps and the connections at the dash and they are all good.
Pulled the new alternator and the battery and had them tested. All good.
I found a bad ground strap on the drivers front side of the engine and replaced.
Is there a relay that controls the lights on the instrument panel? I know that the charging light circuit must be complete to make the alternator work.
Any suggestions would be appreciated.