Also any one have a diagram showing what fuses go where? All the diagrams I've seen for the 72 450SL don't show power windows.

It's been a while, but I have two pics of fuse panel on my HD. I think first one is for my car, second off a 73 450SL. The strips came out of my car, (I think)!

I have had that piggyback relay out, but at moment can't recall what it is for. My guess would be windows because they were added later just for NA market. But I could be wrong. Do your power windows work? All relays are same, so maybe wiring of others will give you a clue?

 

Thanks!!
I've seen before where 3-4 are fuses for the windows. I read somewhere here that the relay in question that looks added on is the window relay. Now to figure what wires go where. Plus on the lower fuse strip the first 2 or 3 must have caught fire as the paper is burnt there and the second bottom from the front fuse has burnt plastic on the lower copper strip.

 

Looking at the 74 wiring diagram, Relay 70. 30 would be the heavy red wire and 87 the heavy black. The small brown would be the ground and connects to 85 and the other wire to 86.

Don't take my word for it - Wiring diagrams should be in the on-line manuals somewhere.

 

Thanks!! Verrrry interrrrestinc!

That relay and the resulting answer's here with maybe a pic should end up in the sacred stickey for 450SL's.......

Which of the above fuse panel papers go with my 1972 450SL setup?

The big black wire is actually brown under the sheath but I think with everyones help it's starting to make sense. I have yet to see an actuall diagram/picture with the piggyback so maybe that was a one year (1972) thing?

One thing I noticed is when the relay energized (now that I know what wire goes where) the red wire on 30 would read 12V (of course) but when I put a meter on #87 I got a very slow ramp up to 6-7V. So tommorow I'll swap out another relay and check again.

So if I understand, fuse #3 and #4 are then powered so I should see voltage at the window switches that then go to the windows.

Almost forgot....What are the 2 fuses on the piggyback panel for? Might as well get the whole piggyback thing/question answered.

Turns out the burned up fuse section was from some random wire that was MickeyMoused to it and dead ended. They must have cut it from whatever accessory they had rigged up when the smoke started!

 

What I don't recognize is the two fuses mounted on the same panel as the relay.
what is the chassis number on yours? Mine is 2913 and I don't recall those.

 

I'll check tommorow. Is the chassis number on the engine compartment tag? My plate in the door was removed in the past during a paint job and never reinstalled. Is ther any way to get a new replacement plate from Mercedes? It's the car the title vin refers to as the same vin is on the radiator support bracket plus I have a lot of the original docs from the original owner including those wierd punched thru tickets with option codes on it.

 

A really cool tool to use is a Power Probe? It can help you identify what is getting power, and you can also send power to specific wires. Also, you might want to try hooking up a self-powered test light to the wires and start probing around. If you suspect the windows, start probing the window's wires, and then probe the wires on the relay. It's tedious work, but it works.

 

Power Probe - no mechanic should be without one!!!! Powerprobe.com

 

It should also have a tag on the windshield A pillar visible through the windshield.

Example: 107.044.12.002913

 

I don't know which of the fuse layout diagrams is correct for the NA 350SL with power windows etc. Apparently even in same model year these can change. The second one (1973 450SL) looks close. I went through same exercise and thought I had figured out which one to use, printed it and had put it in car. But just looked in car and I have no diagram (should be stuck to inside of fusebox cover). The fuse size strips in pic I posted were from my car so at least I know what size fuse to use even if I don't know what it does.

I have attached a couple of pics of my relays - Maybe we do have fuses inside that black box? If so, what are they for?

Rowdie - do you have that black box?

 

The fuses are there in your picture. There is a cover over them. He is missing the cover. Could be why I don't remember seeing them

 

Yes - I corrected my previous post - But what do those fuses protect? Perhaps something Euro cars did not have ?

 

I will check later when it warms up a bit. I have no idea what they are for.

 

I posted question over on Peachparts - Melted there has a '72 and hopefully has diagram.

Checked EPC and couldn't find that fuse holder for early 107s. Did find the mounting bracket though.

Maybe those are not fuses? But they must be - look like 16A reds.

PS: Also noted my EPC runs out in 30 days. Wonder if they will just let me renew? Had help from USA in getting access!

 

'72 has it. '73 does not. They are two 16 amp fuses. One wire one the top left had already been cut.

 

Good Pic! Now to find out what they are for. Maybe RTDS could pull his fuses and see what happens? I could do it, but don't really want to go in there - bad back!

Perhaps they used these for the window lifts instead of 3 & 4?

 

I think you are correct. I ran across and fuse chart in an old Chilton's manual that lists fuse 3, 2A - Radio and fuse 4, 8A - Horn. The chart was for 350SL prior to installation of seat belt warning system.

 

I removed the 16A fuses from 3 & 4 and the windows still worked. Did not go as far as accessing those piggyback fuses, but they and the piggyback relay are likely the power window add on.

Everything else worked with 3 & 4 out. Well actually the seat belt warning did not, but it isn't working with them in either. I think I disabled it because it's a pain! Radio and horn work - they come off different fuses.

I suspect that 3 & 4 are not used on the 72. Wiring diagram for 73 in Chassis manual shows them unused.

 

I know you guys don't need this info, but here's a post showing what the 72-73 relays are for: http://www.benzworld.org/forums/r-c...-c107-sl-slc-class/1594156-1972-350sl-fuel-delivery-ignition-7.html#post4776415
You guys obviously had all the info correct.

 

MB Does not show that number listed on the Meyle relay. Mine are all marked SR 9850. MB PN 001 542 02 19.

 

Mine are marked #014 0540027 Meyle Germany...KW 40/09

Not sure why one side says 20A and the other 30A

 

RDTS, do you still have the fueltank in the 84 380? Scott

 

I used it in the 450Sl. The old one out of the 450SL looks good but needs to be cleaned and new screen put in. It had some fine rust residue that would clog the filter. Looking in thru the top fuel gauge hole looks pretty clean. Not sure where the rust came from.