LED Rear bulbs interference

[rasA4]

bought some LEDs for my rear tails and stop(brake) lights. however when they are in use i am unable to listen to my factory fitted symphony radio clearly, it sounds quite scratchy.

anyone had this problem, and overcome this?


thanks in advance

[akielb]

Do you mean you just purchased LED bulbs to replace the incandescent bulbs in the stock tails? I've always thought of doing that, which brands did you buy. I can't think of any reason that would be caused. Interested to see if anyone else has a clue.

[burner799]

i wish somebody had an answer cause ever since i got hid's my craptastic radio does the same thing when they are on

[Stumanbmx]

i wish somebody had an answer cause ever since i got hid's my craptastic radio does the same thing when they are on

What HID's do you have?

[djwimbo]

As far as changing the bulbs to LED's and causing EMI in the radio, I'm not so sure that's the whole reason.

Adding in the HID's and getting some EMI through the radio is feasible. Where are your ballasts located? Depending on how long the wires are, some people mount the ballasts up by the "firewall". Not exactly ideal. The HID's take >5000 volts to start the arc, and some setups even maintain that high of voltage. That creates a lot of electromagnetic waves around the wires going to the bulb. Those waves induce voltage in surrounding wires, and can result in your issue. This is the same reason why DOT approved spark plug wires are high impedance(they transfer up to 60,000volts), otherwise you get some really weird shit going on.

Back to the OP though. If all you did was remove the light bulb "tray", install the LED's and reinstall them, I don't see how that could cause the issue. Unless there was an issue in the first place and somehow by moving the wires and such around, you discovered it.

Make sure all the wiring is connected properly, and IIRC you should have the amp mounted in the rear as well. Double check the connection at the amp as well.

Have you tried putting the bulbs back in to see if the noise goes away?

[TH85]

As far as changing the bulbs to LED's and causing EMI in the radio, I'm not so sure that's the whole reason.

Adding in the HID's and getting some EMI through the radio is feasible. Where are your ballasts located? Depending on how long the wires are, some people mount the ballasts up by the "firewall". Not exactly ideal. The HID's take >5000 volts to start the arc, and some setups even maintain that high of voltage. That creates a lot of electromagnetic waves around the wires going to the bulb. Those waves induce voltage in surrounding wires, and can result in your issue. This is the same reason why DOT approved spark plug wires are high impedance(they transfer up to 60,000volts), otherwise you get some really weird shit going on.

When i turn on my HID's, sometimes my radio re-sets to preset 1 and ejects the tape player and sometimes blows the fuse...pretty much like a power surge kinda thing....could this happen becaues of the ballasts being located by the firewall???
sorry for the offtopic.

[le91688]

Why wouldnt you put your ballast on the bottom of the headlight in the ballast holder?

[rasA4]

Back to the OP though. If all you did was remove the light bulb "tray", install the LED's and reinstall them, I don't see how that could cause the issue. Unless there was an issue in the first place and somehow by moving the wires and such around, you discovered it.

Make sure all the wiring is connected properly, and IIRC you should have the amp mounted in the rear as well. Double check the connection at the amp as well.

Have you tried putting the bulbs back in to see if the noise goes away?

yes put the original bulbs back, no noise.

[rasA4]

Do you mean you just purchased LED bulbs to replace the incandescent bulbs in the stock tails? I've always thought of doing that, which brands did you buy. I can't think of any reason that would be caused. Interested to see if anyone else has a clue.

yes replacements, was not a brand got them from ebay from china/hong kong they was red ones as no point buying white ones as the brake lights would be pink. think im gonna send them back.

[B5A4Kevin]

kinda odd sit-chew-ay-shun. only cure i can think of is either getting rid of the bulbs (or moving the ballasts to under the headlights in th85's case) or using some shielding material and grounding it to the chassis. to isolate the induction of voltage.