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1983 380 SL
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At this time all wires are cut, labeled and terminated ready to install into the fuse/relay block. Fabrication of the fuse block mount is complete with exception of paint drying. Tonight I will turn the parts over to paint the bottom. Tomorrow with a fresh head I will do the installation. I may run into 1 problem that may delay things for another week. I was afraid to cut the wires too short so they may actually be too long and need to be cut and re terminated. I will find out shortly.
Por15 Top Coat? I thought that was only used over Por15 to provide UV protection. Is it a good paint?
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #683
Por15 Top Coat? I thought that was only used over Por15 to provide UV protection. Is it a good paint?
Its used over POR 15 to provide UV protection but it can also be used as a direct to metal paint. No primer required.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #684
No pictures today, because my phone went out. The fuse/relay block is now wired but not mounted. Challenge now is to figure out how to route the wires in a safe place. So theoretically I should be able to connect the battery, start it up and start testing all the systems. That is what I will be doing tomorrow.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #686
Didn't get it started yet but the fuse/relay block is mounted in position. I had to stop because the wife is coming home. I may continue after about 9:30 tonight. It will probably require several more R&Rs to trim down wires to more acceptable lengths and to place harness clamps. But I'm confident with it now.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #687
Back up and running. Completed checks of all systems, found aux fan and main engine fan not working correctly. Will be looking into it tomorrow.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #689
The main electric fan is now working perfectly. I found an improper connection at the fan controller. Had nothing to do with the fuse/relay block, but I had disconnected some wires to testing and put them on incorrectly. Fixed now. The aux fan seem to also be working correctly, but I'm concerned about how warm the relay gets, it might be normal but I have no way of knowing and I installed a smaller relay than the original. The original relays were ISO standard relays rated at 40 Amp. The replacement is GM 280 style Hi-Power relay. There are no specs that I can find on this relay but the low speed fan circuit runs at 10.5 Amps. I do know that 280 style relays of the same size are available in up to 35 amps, so I may just purchase one for comparison. Who knows, to GM Hi-Power might mean 2 amps.

 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #690
Not a good day today. In fact I may have done some serious damage to things I'm not too sure yet. For some reason the compressor will not turn off. I believe it was turning off yesterday but now I'm not sure. With the limited trouble shooting I did today it appears that I may have fried my AC pushbutton control and the R129 base module. The 129 base module is the equivalent of the R107 OVP relay except it cost $370 and mine only fits a 1996 SL600 so it will be difficult to find used. At this point I would like to get a spare one anyway since it only fits 1 year and 1 model. So far non available in the US on E-bay. Several available in Europe but at 200+ Euro or 170+#. With shipping that will come out to close to $370 US. Car will run without it but I wont have AC. Push button controls are about $270 for rebuilt ones but I'm hoping I could fix mine.

So I'm not sure what caused this at this point but it may have been the fix I did previously to get the main fan to work. Meaning I may have had that right to begin with. Not sure its the only thing I really changed. More to come.
 

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1983 380SL, ivory/dk brown, 46k miles, dual roller timing chain. 1986 560SL, red/white, 190K mile.
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7,208 Posts

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
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10,880 Posts
Discussion Starter #694
With the push button unit now figured out, it was very easy to trouble shoot and determine the problem. It turns out the left and right side connectors are both the same on the push button control. If you swap them the compressor will stay on at all times. Embarrassed, tail between my legs etc, but now I can get back to work.
 

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Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
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10,880 Posts
Discussion Starter #695
Took Samson out for the first drive in 3 months. Of course I had a fire extinguisher with me. Still not ready to install the dash but all the really hard carp is complete. What's left are little brackets to mount stuff like the OBDII and diagnostic ports and a few stray modules. I will also need to make covers for under the dash and the passenger foot well. But those can be done with the dash installed.
 

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