Headlamp issues! - Series 3 (109 pickup)

Hi, I have a 109 Series 3 and am trying to figure out a wiring fault to the headlamps.

When bought, the passenger side bulb was blown, I replaced the sealed beam with one from a friend and it also blew. I have now taken the connector off of the back to test the voltages. The driver side works fine, so I have compared it to this for reference. However all of the terminals give the same voltages on both sides and both operate the same, so I am at a loss as to why the passenger bulb has now blown twice.

I have since tried swapping the working bulb to the passenger side and this worked fine. So is it a wiring issue? Or is there some odd detail I don't know about?



Thanks in advance.

hi and welcome, if you dont have a manual you can download from here,

the main feed comes for both sides for main and dipped is just underneath the bonnet catch, this then splits to both sides if youre having a problem just with passenger side you need to check the wiring from plug to the bulet connectors

its easy enough to unplu the whole headlight with wiring and connect it up directly, need to check each wire for shorting and continuity on the headlight side

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