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#1
01-31-2008, 03:36 PM
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Weird electrical issue 88 300 SEL
My fuel pump and relay went out. I didn't have time to fix it myself, so I took it to the local indy I trust. Fixed it and had it back to me within the day. But when I got home I had a weird electrical issue. When I turn off the ignition the radio doesn't go off. It stays on until I open and then close the door, even with the key out. Even more odd to me, the radio kicks on when I open the door back up, even with the key out of the ignition. When I close the door again it goes off. I replaced my becker about a month ago with a new alpine. Ran all new wires to the speakers and bypassed the amps. But I hadn't had this or any problems since installation. The only electrical thing my mechanic did was to replace the fuel pump relay. Anyone have any thoughts?
I also notice that when I open the door the SRS light comes on. I hadn't noticed that before, maybe I just never paid attention. Anyone with a w126 want to tell me if their SRS light comes on when you open the door?
__________________
Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4 
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#2
01-31-2008, 03:42 PM
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I should add that I used the Crutchfield wire harness and followed several posts related to wire colors, so everything should be hooked up to the radio correctly. I really don't think I hooked the radio up wrong, it worked just fine for over a month.
__________________
Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4
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#3
02-01-2008, 11:19 PM
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The mechanic told me that I had the incorrect fuel pump relay on the car. He replaced it with the correct one. Is it possible that changing to a different fuel pump relay caused this?
__________________
Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4
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#4
02-02-2008, 02:27 AM
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Check the part number on the new relay.
Unusual that it should start right after service... Its possible that you have the wires confused on the new radio - power wire connected to the 'lighting' wire?
__________________
1991 300 SEL 218,000 Km "Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG."
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#5
02-02-2008, 02:52 AM
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So my old part number was 0025455205. This was evidently superseded by part number 0035452405 which is what was put in my car. The original was a nine pin and the new one is a ten pin. It seems like Mercedes has done this with a couple of different relays, where the new part has an extra pin. Anyone know why they keep adding the extra pins? Could this somehow have affected my radio? I know I'm eventually going to have to take the radio out and check the wires, but it was just such a pain in the butt the first time. Somehow the radio is now hooked in with the interior lights, but how could I have hooked into one of those wires. Those shouldn't really live behind the radio or have been hooked up to the old radio.
__________________
Eric Zacharias '88 300 SEL '64 Ford Falcon '99 Infiniti QX4
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#6
02-02-2008, 05:46 AM
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Disconnect the radio and go from there. Hell, you could even just pull the fuse to eliminate it from the system.
Do the same for the fuel pump relay.
__________________
I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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