by Bluestone Wanderer » Fri Oct 06, 2017 4:40 pm
Corrosion on the connectors, bad earth, blown bulbs or fuses are the most likely causes.
Start at the bulb connector then work back to fusebox, relays and even headlight switches.
If voltage is just low at the connector there are relays and small loom available that are switched by the headlamp connector and provide full battery voltage to a new headlamp connector.
Someone on this site used to make them but they are available on ebay.
http://www.ebay.co.uk/itm/H4-Headlight- ... Swa~BYV7YK
Corrosion on the connectors, bad earth, blown bulbs or fuses are the most likely causes.
Start at the bulb connector then work back to fusebox, relays and even headlight switches.
If voltage is just low at the connector there are relays and small loom available that are switched by the headlamp connector and provide full battery voltage to a new headlamp connector.
Someone on this site used to make them but they are available on ebay.
http://www.ebay.co.uk/itm/H4-Headlight-Ceramic-Relay-Wiring-Harness-2Headlamp-Light-Bulb-Fix-Dim-Light-HS-/132039120386?epid=1455147041&hash=item1ebe251602:g:dKoAAOSwa~BYV7YK