[ti]

Originally Posted by JonnyBoy147

If you are saying that when the indicators are flashing your brake lights are also flashing dimmly, then i suggest you have a short between the supply side of your indicators and another part of your electrical system. You could try isolating the cables between the output side of the relay driving your indicators and the indicators and connecting in four test cables. that will rule out a short between one of your cables and earth.


If you are saying when your indicators are flashing and you have your brake pedal pressed your break lights dim to a lower ligh level, that suggests an high load being drawn by your indicators, or a high resistance joint.

To give you a real feel for the problem, i suggest some current measuerments. Idealy with a meter that will read up to 20 amps. If it is only a 10A meter make sure it has a fuse in it to prevent dammaging it. Connect that between your battery positive and your main supply, note the current drain if any, i would expect it to be zero. If you then turn on your hazards and you should get about 8 amps for four hazards, exact figure is (21x4)/12 assuming your battery voltage is 12 V. If you are getting alot higher current then there is a short down stream of your live feed from your relay driving the indicators, if you have a low current you have a high resistance joint (poor connection) and that could include an earth return.

Measuring the resistance between the -ve (earth side) of the indicator and your battry -ve terminal will identify if you have a poor earth, (high resistance greater than an ohm, though thats a lot), you will need to make up extension leads for your meter probably and you must have everything turned off to take resistance readings.

To check the condition of your battery with the engine off, turn on hedlights and measure the battry voltage should be about 11.6 to 12 v. Start engine and check battery voltage it should be about 14.4V if lower or higher suspect your charging system.

Perhaps that helps, jon

Hi Jon

Having seen this post has just reminded me that when i had my last MOT i had a problem with a similar thing, when i put the hazards on and i have the side lights on at the same time the side lights and the instrument panel lights all dim in time with the hazard lights. I have checked all the connections at the sidelights and indicators but all seems ok - any ideas ?