1987 Volvo 760 Turbo - headlight and turn signal diagram. Left turn signal stays on - suspect auxilliary relay incorrectly wired has a 4 pin connection with a red wire, black wire, green red and yellow blue. The black wire goes to the left turn signal. What is the correct connection for the wiring on the 4 pin plug to the relay. Relay does not have a schematic - Part Number is 1323592-1 and it is a 12 V/40 A. Wiring diagram used 1987 - for a 740, 760 Sectin 3 (39). Does not show auxiliary relay
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Re: Headlight/turn signal problem
RELAY, NOISE SUPPRESION/is 1323592 its black and mounted under the hood on the shock tower, check page 4 and page 16 under LHB230FT in your book(item 464) ? why are you messing with this relay if you have a light problem ? does left turn signal stay on with key off /with parks only /with head lights /both front and back turns or front only? have you removed both frt and back bulbs together and ck voltage in sockets ?/wrong bulbs? i would need more info
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The fuel injector on your vehicle not starting, When you turn the key on with the ignition on one side of the injector is ignition(+) the other side is controled by the ECM by grounding it.You vehicle is know as LH fuel system so start as the MAF (known as a mass air meter) you also have a thermo time switch. There is also a relay that controls the operating of the injector this is the suppression relay disconnect and reconnect this relay see if this will help you
There is a relay that controls the headlights, volvo calls it a step relay. You will have to check that power is getting to this relay. If not, check all fuses and wiring. If power supply checks out ok, you may have to replace the relay. Let me know if you need any more info or a wiring diagram.
Make sure the headlights are off and the ignition is OFF.
Working from under the hood, release the clip and remove the wire connector from the back of the lamp assembly.
Unscrew and remove the large locking ring on the back of the headlamp.
Remove the bulb and its holder; replace them as a unit
WARNING When installing new bulbs, never touch the glass bulb with your fingers. The grease will develop a hot spot on the bulb and radically shorten its life.
When reinstalling, make sure that the bulb sits properly in the reflector assembly. Tighten the locking ring and reattach the wiring connector.
Initially, the headlight relay unit would be suspect (likely). I would suspect corrosion on the terminal connector of the fuse box/relay bank (most likely) affecting the headlight. When damp/cold, the corrosion would be triggering the relays to engaged position. The steering column switch would be the least likely since as you posted headlight still on even if that switch is disconnected. the same may also hold true for the signal flasher. A good approach would be to work your way backwards from the headlight, fuse, relay, switch assembly using a DVM measuring/checking for +12V presence.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.