jord294 97 Posted October 29, 2013 Just prepping 405 for mot, and found an electrical issue. Hope someone can help ?? Basically, all lights work perfect when car is not running. But once I start the car, the main beam bulb lights up slightly, so is on with sidelights. Even with full beam, the sidelights are on when they should be off. I've checked and cleaned connections and earth points. Perhaps an alternator issue or switch fault???? I have no idea, so any guidance appreciated Share this post Link to post Share on other sites
TooMany2cvs 65 Posted October 29, 2013 Does it have dimdip? What happens if you unplug the resistor for that? Share this post Link to post Share on other sites
Davy 18 1 Cars Posted October 29, 2013 If they're working as expected when the cars not running, then I'd quess the switch is working ok. Are you sure it's not the 'dimmed dip' coming on? Thats the dipped beam part of the bulb glowing slightly? If so then thats normal I believe for when the ignition is turned on / car running? Share this post Link to post Share on other sites
TooMany2cvs 65 Posted October 29, 2013 Davy - dimdip should put the dip beam on low when the ignition _and_ sidelights are on. Jord's problem is even when the sidies are off, so whatever's happening, it ain't right. I'm wondering if there's a failed diode or relay or electric-thingy in the dimdip system that's feeding back ignition live into the sidelight (and dim-dip) circuit. Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 Was always led to believe it's sidelights, then sidelights with main beam, then main beam and full beam with no sidelights. But my sidelights are on on full beam. All the above is how my car is. Once I turn on the ignition, that's when I get an issue. I'll check resistor again Share this post Link to post Share on other sites
welshpug 1,737 Posted October 29, 2013 Main is full, i guess you mean dipped. Ill check what my brothers 405 does, however it should be the same as a 205, ignition off: sidelights, dipped, main Ignition on: Dim dip, dip and sidelights, main beam. With sides iirc. Share this post Link to post Share on other sites
TooMany2cvs 65 Posted October 29, 2013 Sides are always on with main & dip, ignition on or off. The only difference with dimdip is that you don't have side-only with ignition on, that's replaced with side-plus-dimmed-dip. (there's a clue in the name... <grin>) Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 Thanks for input guys. If you could check your brothers 405 mei, it would be appreciated Sounds like I could be worrying about nothing Share this post Link to post Share on other sites
farmer 328 1 Cars Posted October 29, 2013 Andy, if needed I have the new resistor as I discussed last week on the telephone. If needed will drop one off in the post to you. Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 Does it have dimdip? What happens if you unplug the resistor for that? What exactly does the resistor do ????? Have disconnected it, and lights work as they should. That's with car running and not Share this post Link to post Share on other sites
welshpug 1,737 Posted October 29, 2013 when you turn the sidelights on your dipped beam will come on at 20% power with the ignition on. I would imagine if they're still working as intended, that you are unplugging the cooling fan resistor... Share this post Link to post Share on other sites
TooMany2cvs 65 Posted October 29, 2013 What exactly does the resistor do ????? It reduces the electricity being sent to the dip beam filament when the ignition and sidelights are on. Have disconnected it, and lights work as they should. Can we just recap? With it in place... Ignition on, LIGHT SWITCH OFF - side & dim-dip on? Without it in place... Ignition on, LIGHT SWITCH OFF - nothing on? The way dim-dip should work... Ignition on, lights on side - side & dim-dip Ignition off, lights on side - side only What you'll have now if you did pull the right relay... Ignition on, lights on side - side only Ignition off, lights on side - side only If so, then that just confirms you've got a prob in the dim-dip. Honestly? I'd just bin the resistor. Dim-Dip was a legal requirement on new cars in the UK for a couple of years around the late '80s, early '90s. It's not been required since. It doesn't have to work even if fitted when the car was new. It was never required on new cars anywhere outside the UK, and isn't required to be fitted if you import one. It isn't tested at the MOT. Ignore it. Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 when you turn the sidelights on your dipped beam will come on at 20% power with the ignition on. I would imagine if they're still working as intended, that you are unplugging the cooling fan resistor... Is that how your brothers car is mei? As that is how my car is. It's only when ignition off I get sidelights only. Then on dip I get sidelights aswell Sounds like there isn't anything wrong with my car after all :rolleyes Share this post Link to post Share on other sites
welshpug 1,737 Posted October 29, 2013 yeah, nowt wrong at all by the sounds of it Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 brilliant! happy days thanks for everyones input Share this post Link to post Share on other sites
jord294 97 Posted October 29, 2013 Toomany2cvs Thanks for the more in depth info. I'll probably leave the resistor dis-connected, even though I know it works as it should. I've had a few peugeots over the years, and the 405 is the only car I noticed the issue on Cheers Share this post Link to post Share on other sites
jackherer 543 Posted October 29, 2013 I've had a few peugeots over the years, and the 405 is the only car I noticed the issue on It sounds like it's the first one you've had that actually works properly It's not a surprise really, the wiring on old Peugeots was tarnished and corroded by ten years old, these days it's amazing any of it works at all. Share this post Link to post Share on other sites
jord294 97 Posted October 30, 2013 It sounds like it's the first one you've had that actually works properly It's not a surprise really, the wiring on old Peugeots was tarnished and corroded by ten years old, these days it's amazing any of it works at all. you're probably right Share this post Link to post Share on other sites
welshpug 1,737 Posted October 30, 2013 had a look at my brothers 405 this morning just before dropping it off for MOT, sides are on with each click. so if a headlamp bulb goes down you still have a 5watt glow Share this post Link to post Share on other sites
jord294 97 Posted October 30, 2013 thanks mei that is how mine worked, but have kept resistor unplugged for now Share this post Link to post Share on other sites
welshpug 1,737 Posted October 30, 2013 make sure its not the fan resistor Share this post Link to post Share on other sites
jord294 97 Posted October 30, 2013 make sure its not the fan resistor it's not. it's definitely the one for the lights. Share this post Link to post Share on other sites
