i have lost power to the dash, heater fan, brake lights when the lights are off and blinkers. I have tested the panel with a voltage light under the hood and have no blown fuses but i also don't have power to most fuses.
interior lights door locking system radio,clock and antenna still work.
I am thinking a relay but i don't have a manual to know what goes to what.
thanks in advance

Do the functions which are lost depend on your ignition? Let's look at that first.

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84 300SD
85 380SE
83 528e
95 318ic

Circuit Diagram Index

Likely culprit is fuse 12, either burnt out or making a poor connection.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

yes the non working items would require the key to be on to work. when the key is on only the lights, window radio and clock work. I am taking it in on thursday it is looking like something in the ignition switch that is not feeding the majority of the fuse panel.
I will post what it was when it is fixed.
Thanks

After starting vehicle - wiggle the key very slightly (lightly) left and right and see if things come on. If you find a sweet spot the contact are worn on the ignition switch. This was something I lived with for years on my 85SD.

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