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Old 07-12-2019, 07:44 PM   #5
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Join Date: Aug 2014
Location: Boulder CO

I couldn't find a good wiring diagram either, so be careful if try this:

Pin 85 and 86 are the relay coil. One (85) should be a black wire to ground, the other (86) should be a yellow (?) wire to the light switch. This turns on the relay when switch is on.

Pin 30 is the main power to relay contacts - Green/Red, to battery.

Pins 87 and 87a both close to pin 30 in the relay when the coil is energized (assuming it's the correct DPST relay). You want 87 to go to the step relay pin 56. Sounds like this is your blue/white wire (but shown in other year's wiring diagrams as yellow too).

I'm guessing a bit here, but 87a probably provides power to the parking lights via fuses (white).
'85 245glt b21ft aw71 k-jet -> lh2.4
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