Engine clicks , then turns over when starting.

[K2MSmith]

So my E33 has a U25 diesel. A new gremlin popped up . I turn the key , hear a click ( solenoid ? ) , but doesn’t turn over . I thought battery was dead . On 2nd try it turns over and starts . Sometimes takes 2 tries . It’s intermittent. Anyone know what this is a symptom of ?

 

[Prairie Schooner]

@K2MSmith - I'm definitely no engine wizard, but the first thing I'd do is start checking wiring connections for corrosion. Then terminals for firm connection. Next the solenoid.

 

[Loren Beach]

What Jeff said. And... also remove, clean, and reinstall all the ground (-) connections.

 

[Christian Williams]

Check key/switch unit itself. Jump the wires at the back of it--just connect them momentarily, bypassing the switch. If that starts the engine every time you need a new ignition switch. They do wear out.