Headlamps

 
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lowcatjo
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PostPosted: Sun Sep 06, 2020 8:04 pm    Post subject: Headlamps Reply with quote
So a weird one.

Driving back home tonight, the headlamps started to flick off and then back on whenever I turned the wipers on and off (not every time, but most times)

On checking, it's also doing this whenever I turn the heater on / off, interior lamps on /off also, so anything from the right hand switch panel, but not if I use any other circuits.

Then driving through the village, turned wipers on, lost both dip and main beam, pulled back for flash, that works A OK with no loss or flicker, flicked wipers on and off x2, headlamps came back on, but still flick off momentarily when wipers are turned on / off.

Headlamps are wired via a relay, they are LED modules, but I was having this issue before with H4s occasionally, but not complete loss of lights. Relay is in a relay box under the bonnet.

Tomorrow I'll check all the behind dash connections etc, power and the relay for good connection etc.

Are there any obvious causes, any hints or tips anyone could point towards? Anyone had this issue before??

Thanks. Paul.
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Alan Drover
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PostPosted: Sun Sep 06, 2020 8:25 pm    Post subject: Reply with quote
Paul, check the earths first. It appears to be something behind the panel is intermittently earthing via other circuits.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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websnail
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PostPosted: Mon Sep 07, 2020 3:59 pm    Post subject: Reply with quote
Every time electrics go a little wonky, check the earth connections. Smile
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Previously my daily drives:
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lowcatjo
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Location: Northants, Norfolk and Northern Scotland...

PostPosted: Mon Sep 07, 2020 4:57 pm    Post subject: Reply with quote
Thanks for the pointers, I'll take a look at earths also whilst I've the panel out.

I'll also have a check of the battery main earth again - I recall now that gave me weird symptoms when that was corroded before...
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Alan Drover
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Location: North West Hampshire

PostPosted: Mon Sep 07, 2020 5:52 pm    Post subject: Reply with quote
I smear the battery terminals with petroleum jelly. Electrical switch cleaner is good at getting the terminals clean. Check the connectors in the headlight bowls to the headlamp bulbs. Corrosion occurs here and again switch cleaner shifts it.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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