screw the schematic. I just fixed mine on my w116 6.9 and they're very
First of all, check for any obviously blown components, if there are any,
insure that you have the correct brake light bulbs installed, near enough is
not good enough, they will damage the amp.
If there are any blown components, replace them.
9 out of 10 times all that it needs is a blanket resolder of the entire
board, this can be tricky as they are dipped in varnish when they are
I'd be very surprised if you cant get it working, unless you cant solder to
save your life. very primitive, simple, elementary school electronics :)
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