Through poorly insulated cables or moisture in the steering even a headlamp plug can give up.
New headlamps are often delivered without a bulb holder. Plugs for headllamps are available with holder and with clamp mounting. These are not exchangeable with each other. In the item description you can find the reference corresponding to the sockets of the light bulb!
SIP-TIP:
Always order a set of new bulbs.
Hersteller/Manufacturer:
Siem
Via Stazione 60
12066 Monticelli d'Alba - Italy
www.graborgm.com