17-11-2019, 11:38 AM
(This post was last modified: 17-11-2019, 02:11 PM by Ian McGowan.)
Hi Colin I would switch on the headlights with the engine stopped, measure accurately the voltage at the battery terminals and then at the bulb contacts on each headlight. There will be some voltage drop, if this is significant, I would then work through the lighting circuit from the battery towards the bulbs measuring the voltage at every accessible point. This should enable you to identify the point of significant voltage drop, if there is one and allow you to address that issue first.
It is possible of course, that your battery is tired, or if you have one, that the battery isolator switch is introducing resistance into the circuit - check the voltage drop, under load, across this switch as a first job. It can go faulty and it has happened to me once.
It is possible of course, that your battery is tired, or if you have one, that the battery isolator switch is introducing resistance into the circuit - check the voltage drop, under load, across this switch as a first job. It can go faulty and it has happened to me once.