PeachParts Mercedes-Benz Forum - View Single Post - Can someone please help me?!?! Alternator maybe?

JamesDean · #6 06-19-2013, 11:39 AM

Quote:

Originally Posted by lsmalley

I tightened the belt, it was loose to the point that I could slip it over a pulley with mild to moderate force without loosening the tensioner. Lee, I took your advice and here are the readings at idle:
1. no load ~ 13.78v
2. lights ~ 13.4v
3.lights, a/c ~ 12.7v
4. lights, a/c, high speed aux fans, radio ~ 12.4v

all readings are an approximate estimation of where the multimeter was fluctuating. I'll see if tightening thee belt helped tomorrow

You have the high speed fans jumpered for the a/c? Thats about 20-30 amps of draw right there. (Thats what mine draw at least). Figure HID's draw 4-5 amps each (from what I saw a 35W HID's ballast will draw that)...

My recommendation is that you install a higher output alternator. That is the best solution.

This is what I have on my 300D. It will also fit the 190. I don't recall if I had to clock the alternator or not...

99 02 Mercedes ML430 ML500 ML55 Alternator Generator New 0101548302 Bosch | eBay

We were having the same problem on my 420SEL, power output would drop when load increased to the point where it would slowly kill the battery.