Rear flasher problem
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Re: Rear flasher problem
You get that reading because the front lamp is in parallel with the rear lamp.... remove the front bulb and you should read infinity....
Re: Rear flasher problem
Ah right, I understand what you say. I also ran a good earth direct to the bulb holder with no improvement. Out there again tomorrow then! 
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biomed32uk
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Re: Rear flasher problem
Yes, you are measuring the resistance of the front bulb there. I dont want to be patronising but pictures help sometimes I have done a very basic drawing for you - very crude though.
You were measuring the resistance path of the red line - the front bulb.
Measure the resistance from the body of the lamp holder to earth / body, that should be zero ohms.
On my drawing the centre of the bulb is point 1, find the green red wire at the indicator switch, there are bullet connectors just up underneath, separate it there and measure from the bulb to the green red from the loom point 2, should be zero ohms. You'll need a piece of wire to run round to the back so you can connect across it from where you are working.
Alternatively move the switch to the LH indicate position, leave everything connected there and find the green and brown at the flasher point 3, pull it off. Again you'll need a piece of wire to push in the wire from the loom and run round to the back. Measure from the centre contact to there and again should be zero or pretty close to it.
Sure you said it was a pick up or van, but odds on the loom would be the same as a car and there will be a joint on the os where the loom then runs over to the ns. On a car its in the boot behind the os rear lamp, a whole cluster of bullets.
Make sure the battery is disconnected when youre doing it.
From the connections on the indicator switch that go the LH or RH bulbs there should be zero ohms from there to the centre of the respective bulbs, back and front. And again from the body of the lamp holder to the car body zero ohms. Everything on a car regarding electrical connections needs to be clean, bright and tight to get current through it.[frame]
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You were measuring the resistance path of the red line - the front bulb.
Measure the resistance from the body of the lamp holder to earth / body, that should be zero ohms.
On my drawing the centre of the bulb is point 1, find the green red wire at the indicator switch, there are bullet connectors just up underneath, separate it there and measure from the bulb to the green red from the loom point 2, should be zero ohms. You'll need a piece of wire to run round to the back so you can connect across it from where you are working.
Alternatively move the switch to the LH indicate position, leave everything connected there and find the green and brown at the flasher point 3, pull it off. Again you'll need a piece of wire to push in the wire from the loom and run round to the back. Measure from the centre contact to there and again should be zero or pretty close to it.
Sure you said it was a pick up or van, but odds on the loom would be the same as a car and there will be a joint on the os where the loom then runs over to the ns. On a car its in the boot behind the os rear lamp, a whole cluster of bullets.
Make sure the battery is disconnected when youre doing it.
From the connections on the indicator switch that go the LH or RH bulbs there should be zero ohms from there to the centre of the respective bulbs, back and front. And again from the body of the lamp holder to the car body zero ohms. Everything on a car regarding electrical connections needs to be clean, bright and tight to get current through it.[frame]
Re: Rear flasher problem
Just got up this morning to find your excellent post, thanks for taking time to do it! Weather not too good to push the pickup out at the moment but when I can get back to it your post will be most valuable.
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biomed32uk
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Re: Rear flasher problem
No problem, hope it makes a little clearer as to whats what.
Not much of a day for playing cars, it was horrible in Essex this morning, I'm trying to get a few little paint touch ins done.
Not much of a day for playing cars, it was horrible in Essex this morning, I'm trying to get a few little paint touch ins done.
Re: Rear flasher problem
Well following instructions I separated green/red wires from indicator switch and with meter between that and centre connection of bulb holder got a reading of 7 ohms. Tried the alternative option suggested and got the same 7 ohms.
I then unravelled the covering from the rear cluster of bullet connectors and isolated the green/red wire that crosses over to the n/s lamp, with a meter between the wire and the bullet that pushes into the bulb holder centre got a 7 ohm reading. I then temporarily put a new wire directly between the green/red wire from the harness to the bulb holder centre and tried indicators, they all worked! So I'm concluding the problem is in that short run of wire. It has baffled me that this wire is green/red at one end and just green at the bulb end, it could be there is a join half way along, and could be the cause. I will strip of the covering later and get to the bottom of that one but looks like I have now got a result thanks to some very helpful advise. Thank you.
I then unravelled the covering from the rear cluster of bullet connectors and isolated the green/red wire that crosses over to the n/s lamp, with a meter between the wire and the bullet that pushes into the bulb holder centre got a 7 ohm reading. I then temporarily put a new wire directly between the green/red wire from the harness to the bulb holder centre and tried indicators, they all worked! So I'm concluding the problem is in that short run of wire. It has baffled me that this wire is green/red at one end and just green at the bulb end, it could be there is a join half way along, and could be the cause. I will strip of the covering later and get to the bottom of that one but looks like I have now got a result thanks to some very helpful advise. Thank you.
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biomed32uk
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Re: Rear flasher problem
Send some of the nice weather down south please, not too bad a day after the rain cleared this morning.
Great stuff, seems you have a result there, and that's the exact method of logical electrical fault finding to narrow down where the problem lies.
There will be another connector close to the offending lamp, so that as you say may be the cause. I had no end of trouble with the wiring in the boot plus it had been bodged and ended up replacing all of the old bullets at the back end for the slightly better japanese style bullets, bit more postive in thier connection and a better cover to keep the damp and grot out.
Find it, pull it apart and clean it up, you may need to push something down the socket part to clean it up and make sure its tight when you push the bullet in, may need carefully nipping up a little. When you have them back together a wipe of silicon grease round the ends help to keep the damp out.
Excellent job.....
Great stuff, seems you have a result there, and that's the exact method of logical electrical fault finding to narrow down where the problem lies.
There will be another connector close to the offending lamp, so that as you say may be the cause. I had no end of trouble with the wiring in the boot plus it had been bodged and ended up replacing all of the old bullets at the back end for the slightly better japanese style bullets, bit more postive in thier connection and a better cover to keep the damp and grot out.
Find it, pull it apart and clean it up, you may need to push something down the socket part to clean it up and make sure its tight when you push the bullet in, may need carefully nipping up a little. When you have them back together a wipe of silicon grease round the ends help to keep the damp out.
Excellent job.....
Re: Rear flasher problem
Stripped the covering from the bundle near to the n/s lamp, I have never seen such a mass of rust around bullet connectors, it was caked on even though the bundle was completely sealed, obviously not moisture proof! I had to break away the connectors they were that bad. Now bullets cleaned and new connectors fitted. Indicators working! Many thanks again and will remember those tips. Hope the touch ups went ok.
Re: Rear flasher problem
Well done ! A wipe of silicone grease (or vaseline) around the connectors helps .....