94 940 alternator to ignition wire diagram reason is Exciter wire to voltage regulater is dead. Or can i run new wire From a fuse or ???
If so which fuse?? Please help

 

Not sure what you are asking - here's a wiring diagram

The alternator (6/26) has two wires going to it. (if it's a gas engine) The big red wire (B+) that goes to the starter (6/25, unless it's diesel) then to the battery (1/1)

And - The small red wire (D+) goes directly to the warning light in the instrument cluster. 10/87 is the warning light, 5/1 is the cluster.

 

The Small red wire has no juice to it so voltage regulator not working

 

Also battery indicater light doesn't work ?

 

When you turn the key on power goes to the warning light and is grounded in the alternator. Bulb is illuminated. Once the alternator is charging there is power at the D+ terminal and still power from the key - battery voltage on both sides of the bulb makes the bulb go out - indicating that it is charging.

To test - Unplug with small red wire at the alternator, touch it to ground with the key on and see the alternator warning light comes on - if it does that circuit from the key through the bulb to the alternator is good. If the bulb does not light - bad bulb, bad connection somewhere in that circuit. If the bulb lights up in the previous test but does not when plugged in - And the alternator case is grounded and large B+ wire has battery voltage - you have a bad alternator. (or possible worn out brushes in the voltage regulator) Make sure the ground wire )if equipped) on the alternator is ok.

 

Ok I'll try that. I've cleaned all the grounds can find in motor compartment. & replaced ground from alternator to block. are there some under dash ?

 

Well no battery light. Just borrowed a ohm meter to do a complete check. But if no juice coming out of red wire voltage regulator won't activate right?? So sounds like bad connection at instrument cluster ?
So you have to pull cluster out to check ?
& how does it come out? I did find video on how to check alternator , battery & cables

 

It is a 94 940 T wagon ( gas)

 

Been a long time, but here is what Volvo says - hope it's correct

 

Not sure what you mean - red wire unplugged from the alternator and there is no voltage on the wire or the alternator? And the warning light does not illuminate? How about a bad bulb in the instrument cluster causing that?

 

Well looks like gotta be a magician to change bulb w/o pulling cluster. Thanks for help I'm done for today. Let you know what find tommorrow.

 

Stellar, you are looking at a 960 instrument cluster picture and instructions, not a 940...

 

Know where to get 940 cluster diagram? Think figured out how to remove but more info always good

 

Vida only has instructions for the 940se/960

Here's something courtesy of friends across the pond for a 940 instrument cluster removal.

https://www.volvoclub.org.uk/faq/Ele...ClusterRemoval

 

COOL bout to start on it. Thanks

 

So alternator is good. No power from Exciter wire. Cluster out NOW WHAT ? Need warning light bulb location/#'s / diagram. Think going to have to make new exciter wire ?? ANY IDEAS/ HELP

 

battery warning light bulb # 10 checks good out of cluster

 

Using your ohmmeter make sure the D+ wire is continuous from the alternator (unplugged from the alternator) to terminal 16 (small red wire) in the c plug or directly to the bulb connector with the c plug attached. Make sure you have battery voltage to terminal 4 (blue/red wire) on the d plug (the other side of the bulb that gets power from the ignition switch) or on the other side of the bulb connector.

Does your alternator warning light not illuminate when the key is on and the D+ wire is grounded? Bad connection or bad bulb is about your only choice. Have you swapped in another bulb? (there's 10 or so to choose from)

Does your alternator not charge? Are you calling the D+ wire the "exciter" wire? Sorry I've never checked for "power" at the "exciter" wire (in 45 years). First I measure alternator output, if warning light is not working that can prevent charging on some cars. If either is wrong - figure out (from supplied Diagrams) why. If warning light works when D+ is grounded and alternator does not charge - The alternator (or regulator) is bad. Am I missing something?

 

I May not be explaining clearly: Ok here we go : D+ (lil red wire) aka: Exciter Wire is Dead. History : I've had car 2yrs don't remember battery light ever workin.
SO did test. D+ Exciter unplugged w key on no juice. Made a jumper battery to D+ : started car put meter on battery its discharging, connected jumper system Started charging , unplug jumper no charge. Pulled Cluster out checked bulb (10 ? )out of Cluster it works ( why need a list of which bulb which) tighted all the screws none really loose. Going to clean plug connections then ????

 

So probably need to make mannual d+ wire w on off switch ?? Unless D+ gets juice back after cluster reconnected??