Hi all,

After doing some rewiring, my high beam works only in a "pull the stalk" mode, even with headlights on. I think problem is thick white wire coming off the 86b terminal of step relay on a fender, which is currently connected to nothing. After some experiments with a voltage meter, it seems that this wire gets 12V when low beam is on. But where should I connect this wire to?

Thanks

This is to build on what Lucid already said.

The stock connections on the step relay are:

31b.......Brown from stalk switch, activates relay coilby providing ground.

15........two - red from light switch, blue to terminal 81a which powers lights when using flasher.

56........Yellow from 87 on the headlight relay (closed when key is on). Power from light switch for low and high beams.

56b.......Gray to BFWS relay for low beams.

56a.......three - two red (to each high beam) one w-r to dash high beam indicator


The high beams do not go through the BFWS relay, only the low beams.

The BFWS can be by-passed at the BFWS relay by redirecting the gray to the two blue wires (BFWS terminal #2 & 7).

If your wiring is not like this, then something else is goind on.

Good Luck,

Bob

:>)

Thanks Bob and Lucid for your help.

[quote]

The BFWS can be by-passed at the BFWS relay by redirecting the gray to the two blue wires (BFWS terminal #2 & 7).

[/quote]

I think that's the point in this problem. The wiring was changed significally and it's impossible now to reproduce BFWS terminals. How can I "simulate" those two blue wires @ #2 & #7? What are they? Hot 12V?

"I think that's the point in this problem. The wiring was changed significally and it's impossible now to reproduce BFWS terminals. How can I "simulate" those two blue wires @ #2 & #7? What are they? Hot 12V?"

I described those two Blue wires earlier (Monday)...

"There is no 86b on the step relay. I guess you mean 56b which should have a Gray wire running back into the cabin to the Bulb Failure Sensor. From the BFS, 2 Blue wires come out, one to each Low Beam."

The Gray wire (hot with Low Beams selected) comes INTO the BFWS at #6 (56b), goes thru two oarallel sensing coils, then LEAVESthe BFWS at treminals #2 (56bL) and #7 (56bR) via the two Blue wires to the Left and Right headlights.

I don't know where those 2, 6, and 7 pin numbers are, except on some diagrams. But the others are on the bottom of the BFWS. Find 56b then count CCW left to 56bL (6) and 56bR (7).

The Gray wire connected to the 2 Blues should give you Low beams, which I guess you lready have, since you posted about a High Beam problem. But the Highs don't go through the BFWS (and yours has been "eliminated"?), so why are we there?

Here's the normal (non-flasher) HIGH BEAM wiring at the stepper relay...
INPUT—Terminal 56 Yellow wire from headlight relay in cabin
OUTPUT—Terminal 56a, when relay is toggled to High position, plus R/W wire to High Beam indicator


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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Thanks Bruce, problem was corroded socket.

Bob, a good clear wiring outline but one minor (?) point...

"15........two - red from light switch, blue to terminal 81a which powers lights when using flasher.

Thanks to my hand lens, I see the red wire coming from WD item #2, the +12v buss near the battery (unfused source). But I'm still not clear on Eesti's problem or what has been rewired.



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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

There is no 86b on the step relay. I guess you mean 56b which should have a Gray wire running back into the cabin to the Bulb Failure Sensor. From the BFS, 2 Blue wires come out, one to each Low Beam.

The High Beams are the 2 Red wires coming from terminal 56a on the step relay. They must be OK if the stalk flasher switch works.

But the voltage source for flashing the Highs (terminal 15) is not the same one used for normal lighting. That comes in on terminal 56, and is common to both High and Low beams. So if normal Highs don't work I'd suspect the step relay itself, or the "rewiring" you mentioned.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Sorry, I meant 56b instead of 86b. The purpose of "rewiring" was to eliminate the BFS, so it doesn't exist anymore. 56b has two gray wires - one is thicker and other thinner. Thinner one goes to cabin, supposedly to light switch, but problem is to find out, where thicker one is supposed to go. 56a is now directly connected to both high beams. The step relay itself is OK, I have another one that behaves identically.

56b has two gray wires - one is thicker and other thinner. Thinner one goes to cabin, supposedly to light switch, but problem is to find out, where thicker one is supposed to go.

The diagrams show only one wire at stepper 56b (to BFS), and I can't think of a reason for another. Afraid I'm no help there.

But the Diagrams _do_ show a second (Blue/white) wire at the BFS end of the Gray one. It was meant to power Fuse 14 for Fog light switch when Low beams are on.. Maybe it got wired in at the other end (stepper) for some reason?

56a is now directly connected to both high beams.

Don't understand the "is now...". What you describe is the normal wiring for Highs, as I said in previous response.



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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.