luda

How can I get access to change the light bulb in the overhead trip computer on a 98 ML320?

Luda

marcelc

You can't replace the bulb, you are supposed to replace the whole trip computer!

I am waiting for mine to fail, or someone to give me a failed one, and I will try to fit an LED in place of the bulb; I have done this on other equipment (not MB) and I have always been happy with the result.

It is not a risky thing to attempt as the old trip computer is otherwise worthless.

mihir_d

I thought halogen bulbs work on resistence...LEDs offer very little resistence compared to halogen bulbs, so just doing a simple replace could fry the circuit, right?

What do you do? Put a resistor in series or something?

007ML500

That happened to me last year. There is no bulb to service so I replaced the whole unit. I still have my old one with the burned out light. Computer still works though. I'm sure if you know what your doing you could fix it.

luda

Thanks Guys.
I'll probably leave it as it is until "marcelc" carry out his experiment.
Who care about the fuel economy when it's dark?

Luda.

marcelc

Yes, you must either solder a resistor in series with the LED or buy one of those 12v LED's which already come with the resistor built-in.

You select the resistor for the normal current specified for the LED, 20mA is common for the older types, some of the newer, very bright ones take 70mA or more.

yiwan

Hi can you tell me is it the one with mode and reset button if yes can you give me price with post to Dundee

jtysin3617

Theres a post with pics on this site that show you a way to change the light bulbs in that unit. Seems pretty simple too!