Fuse confusion 1965 220SEb - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 10-09-2015, 03:45 PM Thread Starter
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Vehicle: 1965 220SEb manual
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Fuse confusion 1965 220SEb

Hello,

I have a 1965 220sb that has a M127 engine and fuel injection retrofitted. The chassis vins are for a 220s. The is also additional non-stock wiring for the fuel injection. For example, to the fuel pump off the gas tank that I don't think would have been there without fuel injection.

I am trying to track down a car shutting off problem and then no gen light when I retry the key. Then it will miraculously come back. I was double checking the fuses. I am trying to figure out what fuse configuration I should have. My Mercedes guy suggested I should have 2, 25 amp fuses at 2 and 6 position. But there has only been one 25amp one at 2 since I bought it a few months ago. The rest 8amp.

I also wonder what the "automatic starting aide" is.

So I started the car with fuse 6 out and it started and revved fine. The blower motor didn't work. With fuse 4 out the car started fine and the fuel gauge worked fine. I could not check the stop lights because I was alone.

Any ideas? I suppose I don't need the 25 amp in slot 6 if it has been that way for a few months of regular driving.

Just not sure what fuse illustration I should follow. The 2 photos are of my fuse box in the 220s.

Thank you.
Eddie
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1965 220SEb
1968 230s
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post #2 of 10 (permalink) Old 10-10-2015, 07:15 AM
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Try checking your generator?
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post #3 of 10 (permalink) Old 10-10-2015, 02:51 PM Thread Starter
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Good point. I will see if there is a loose connection. The power has cut out for a second and then popped right back on and then the second time it cut off, I pulled over and molested the wires under the dash and around the ignition and then it started back up. Not sure what I did had any effect. I have tried to do the same thing with engine running and I can't get the car to short out again.

Thanks

1965 220SEb
1968 230s
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post #4 of 10 (permalink) Old 10-11-2015, 01:39 AM
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I would check for a bad ground from battery to chassis.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
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post #5 of 10 (permalink) Old 10-11-2015, 02:29 AM Thread Starter
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The ground is solid as well as the positive. I cleaned that all up a couple months ago.

Could a loose connection at the starter also cause this effect? Or is that out of play after starting?

1965 220SEb
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post #6 of 10 (permalink) Old 10-11-2015, 05:08 AM
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If grounds are good, next likely problem area would be the ignition switch as well as the wires leading to and fro.
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post #7 of 10 (permalink) Old 10-12-2015, 04:36 AM
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I would remove and clean the starter positive leads as well, it can be effected by contaminations due to location and temp .
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post #8 of 10 (permalink) Old 10-12-2015, 05:53 AM
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Quote:
Originally Posted by DuaneAllman View Post



I am trying to track down a car shutting off problem and then no gen light when I retry the key.

Quote:
Originally Posted by ejboyd5 View Post
If grounds are good, next likely problem area would be the ignition switch as well as the wires leading to and fro.

I have not experienced the car shutting off due to the key position, but I have about three experiences I can speak about that might shed some light on possible causes.

1) I had a 1981 280slc that would not work the windows or blower fan if you did not turn the key slightly to the left after starting it. There was some play, or not enough spring pressure to return the key from the starting position where the windows and blower lost power. It was one reason the previous owner got rid of the car thinking the blower and windows didn't work anymore. The fix was simple if you knew what was up. So... Take note the position of your ignition key, and don't hang a ton of keys on a heavy keychain from it.

2) I had a D-jet 1973 450sl that had a loose small red wire on the positive battery terminal that went to the electronic fuel management system, and when I hit a bump sometimes, the car would cut out. Make sure your ignition and fuel management system are always getting power.

3) I never resolved this issue, but a 1972 250c I owned would ALWAYS have the generator/battery light on whenever the battery was connected. That car had lots of wires and hoses eaten by rodents. The alternator did not charge the battery. I don't know the cause, but included an extra alternator when I sold the car.

.

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post #9 of 10 (permalink) Old 10-13-2015, 09:54 PM Thread Starter
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I am waiting to see if the car will turn off again. One possibly related symptom is that the gen light stays on for the first few minutes of running the car and sometimes when the idle is low. However I am running both a 250w subwoofer amp and a 300w 4 channel amp in the car so I have to assume the charging is going okay.

The second time the car shut off the amps were not connected because of some Miracle Paint work I was doing in the front floorboard area. So I don't think the power connections are related. They were the first thing I checked as well.

Fonzi, both of my previous w111s had would shut off if the key was off a bit. But that doesn't seem to be the case. This ignition seems solid so far. I will check into the fuel management power line. But did that just cut the fuel or did it cut power to the who car (my situation)?

I will report back when the problem occurs again.

Thanks

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post #10 of 10 (permalink) Old 10-14-2015, 06:14 AM
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Quote:
Originally Posted by DuaneAllman View Post



Fonzi, both of my previous w111s had would shut off if the key was off a bit. But that doesn't seem to be the case. This ignition seems solid so far. I will check into the fuel management power line. But did that just cut the fuel or did it cut power to the who car (my situation)?



I will report back when the problem occurs again.



I am sorry I don't remember, but I think it was just the fuel management, not the whole car.

If your problem looks like power is being cut to the entire car, then it seems that you can look at a wiring diagram and see if there's anything more than just the battery connections that would cause that.

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