volvo aq125a wiring diagram needed

[greg578]

I have an 82 bayliner with the 125 engine and I'm not getting juice to my plugs. I have checked and rechecked the wires. I have replaced the coil and the breaker. All the fuses I can find are still good. It's got a brand new battery w/ a full charge. I have taken the coil plug off the distributor and have been checking for spark there to eliminate that possible cause. I have also checked with the plugs. I have the volvo engine and stern drive book but the wiring diagram does not offer much assistance, does anyone out there have a better scematic that I can take a look at? thanks

 

[captkid]

Re: volvo aq125a wiring diagram needed

greg<br /><br />i have a diagram kicking around I can email ya... I also have an AQ125 I am parting out if you ever need anything <br /><br />whats your email?

 

[greg578]

Re: volvo aq125a wiring diagram needed

That would be great. I wish I would have met you about 2 months ago. I have become well known with my local parts guy. My e-mail is greg578@yahoo.com

 

[captkid]

Re: volvo aq125a wiring diagram needed

in your box

 

[Peter J Fraser]

Re: volvo aq125a wiring diagram needed

Greg,<br />This has happened to me.<br /><br />When I got my boat last year (AQ170c) I couldnt get any spark either.<br /><br />The wires on the Ign switch were incorrect and power had been applied to the coil unswitched via the accessories terminal. trouble was that when I cranked it over that circuit goes open and no power is at the ballast for the coil. No sparks at all.<br />I finally removed the Ign switch and pulled ALL the wires, then put them back to where they belong and everything was good from there.<br />The wiring diagram will help you for sure.<br /><br />Good luck.<br /><br />Peter

 

[greg578]

Re: volvo aq125a wiring diagram needed

Thanks for the diagram captkid. That's just about the same one I got in my volvo repair book. I was hoping you might of had one that is a little more detailed. I haven't tried looking at the ignition switch yet. I had the engine running not too long ago. It decided to quit sparking after I rebuilt the carb changed the oil+filter, replaced fuel filter/seperator and gave it new plugs. I am going to get new points and condenser today. I'll check the ign switch too.

 

[captkid]

Re: volvo aq125a wiring diagram needed

def check the ignition switch... I picked up my 79' Bayline in the fall and when I turned her over I didnt have any spark either... I replace the ignition switch with a good $30 unit... hmm now that i think about it the engine wasent even turning with the old key and switch... but neways I had spark after the new switch was installed, but it was a weak spark, so got new points for like $8 at NAPA and now have a healty spark... <br /><br />But that diagram worked great for me, hope it helps... if you have any questions, I maybe able to help ya out <br /><br />kid

 

[greg578]

Re: volvo aq125a wiring diagram needed

Well I replaced the points and condenser today. Unfortuanetly I didn't have alot of time to work on it cause of a nasty rainstorm. The few minutes I did tinker around with it I still didn't get any spark. I didn't get to the ignition switch yet but that is next on the list. The starter will turn the engine over so I don't see how the ign switch could be bad but I'll give it a shot. I'll try rotating the tires on the trailer if it might help. I've been trying to get this engine running correctly for almost two months now. Thanks for all the help

 

[Peter J Fraser]

Re: volvo aq125a wiring diagram needed

Greg,<br />Can you get into the back of the ign switch ok.<br />If so you can check for power on the switch terminals with a probe light.<br />If you have power on the IGN terminal there then go back down the harness to the engine to check for power at the coil or the ballast resister if fitted.<br />If there is no power at the back then follow the harness back from the engine towards the dash as there should be a male / female connection on the harness 4 or 5 feet from the engine.<br />You may have a problem in the terminals in that area that could be the reason for no power in the ign circuit. <br />Push the boots back from the connector and use your probe light or multimeter to follow the circuits.<br />If this has been wet with bilge water then it is possible you have dry joints and no continuity.<br /><br />Keep trying<br /><br />Peter

 

[greg578]

Re: volvo aq125a wiring diagram needed

I have power to the coil with the ign switch turned in the on position. I replaced the coil and I got an exact replacement, I have yet to find a resistor. I don't know if it has one or not, I'm guessing not. I have also flip flopped the two wires back and forth on the coil(pos to neg) thinking maybe they were on backwards. I'm pretty much stumped right now

 

[rattana]

Re: volvo aq125a wiring diagram needed

Greg make sure the +12V wire is on the positive side of the coil. You will have to check if you have +12V when cranking as well as when the key is in the run position. They are 2 different circuits. For a quick test connect a wire from the battery or any other constant voltage source to the positive side of the coil and try to start it. Let us know if it starts that way. Don't leave the wire connected as it will put too much stress on your coil.<br />Alos make sure your points are opening and closing as you crank it over. The gap should be about .020"-.022"

 

[Dunaruna]

Re: volvo aq125a wiring diagram needed

Quote "You will have to check if you have +12V when cranking as well as when the key is in the run position. They are 2 different circuits."<br /><br />You beat me to it. Greg, you may still have a faulty ignition switch. <br /><br />Aldo

 

[greg578]

Re: volvo aq125a wiring diagram needed

Ok I'll check the voltage when I'm cranking as well as in the run position. I know before I replaced the coil I was getting 12.6v at the battery and 11.9 at the coil with the ign switch in the run posistion. The book stated that less than a 1 volt drop was acceptable. How exactly am I suppose to check the gaps for the points? I am unfamiliar with this process

 

[Dunaruna]

Re: volvo aq125a wiring diagram needed

Greg, use a feeler gauge. 0.016 thou (0.40mm). Also clean point surface with non residual cleaner, brake cleaner or contact cleaner. Once motor is running, you can more accuratly set points using a dwell meter (62 -+ 3 degrees).<br /><br />Aldo

 

[greg578]

Re: volvo aq125a wiring diagram needed

it's a brand new set of points, i installed them today. I cleaned the shaft also and greased it as well with the provided grease pill. If and when I get the motor running I will check it again. To my understanding and visual confirmation the shaft for the distributor is basically square and varies the clearance of the points once about every milisecond. How am I suppose to check clearance at that rate?

 

[Peter J Fraser]

Re: volvo aq125a wiring diagram needed

Lift your Dist cap off and bar over the engine until the rubing block of the contact set is on the top of the dist cam lobe. Adjust the gap to the specs that rattana gave you and it should work.<br />If you then turn the motor a little to the point where the points are fully closed you can flick the moving contact away from the base contact and you should see the spark arc as the points break..<br />Just recheck your assembly of the insulator on the end of the flat spring where it connects to the terminal or wire that comes through the dist body. That must be insulated from the distributor body or the points dont work at all.<br />Some of these wires have a horse shoe shaped terminal on the end that is inside the distributor. That terminal must fit between the spring and the insulator and not behind the insulator.

 

[greg578]

Re: volvo aq125a wiring diagram needed

ok cool I'll give that a shot cause I just threw the new points in and completly overlooked that whole adjustment slot I saw on them(guess I had a mind blank on that one) thanks!!!!

 

[greg578]

Re: volvo aq125a wiring diagram needed

ok great news it starts and runs. It was the points gap that did it finally. Thanks for everyones help. Now I gotta figure out why i can't give it any throttle. It'll only get up to about 1800rpm before it stalls. I'm thinking that it's just adjusting the carb a little more and hopefully it'll be ok thanks again

 

[Peter J Fraser]

Re: volvo aq125a wiring diagram needed

Hi Greg,<br />Now you've got it running again recheck your Ign timing to make sure it is within specs.<br /><br /><br />Peter

 

[rattana]

Re: volvo aq125a wiring diagram needed

Also Check that the choke is open all the way.