series parallel switch rebuild (1 Viewer)

[PHIL O]

has anyone rebuilt their series parallel solenoid? it looks sealed from factory, but i am guessing there is a way to open it. or could anyone post a link to a thread discussing this. search has not been helping since the switch comes by many names and the results are limited to what i call the series parallel switch. i am suspecting this is the culprit of my no start problem. one day i tried to strat the hdj81 but only a click from a relay. i ruled out the starter since i have rebuilt it recently. then i plugged in a jump starter powerbank on the driver's side battery and was able to start it. the next time, i plugged the jump starter on the other battery but couldnt get it to start. it only starts when i plug the jump starter to the driver's side battery making me think that the ignition switch doesnt connect both in series when i turn the key. thank you gents for your inputs

 

[Squash]

Have you load test the fusible link. These will light up a test light, but not enough juice for the start circuit.
Line runs from the PS battery and under the windshield washer.
I assume that both batteries are fully charged and all connectors are tight?
You'd be surprised how a loose battery post will screw up the start circuit.

 

[HDJ80L]

You are talking about the 12-24V voltage converter relay in the engine bay right? That component is not designed to be opened up and serviced, if it's broken you'd have to find a replacement or look for another solution like 12V starter conversion. There's a detailed troubleshooting section for the voltage converter relay in the engine manual you can follow to test the component itself. But since you mention that a powerbank helps with starting it sounds more like its a battery or battery connection issue. Both batteries need to be healthy in order for the 24V starting system to work properly.

 

[PHIL O]

Have you load test the fusible link. These will light up a test light, but not enough juice for the start circuit.
Line runs from the PS battery and under the windshield washer.
I assume that both batteries are fully charged and all connectors are tight?
You'd be surprised how a loose battery post will screw up the start circuit.

thank you Squash. fusible link has continuity as i have chaecked. the car is with my brother right now so i can only troubleshoot it when i get home. i let him use my jump starter powerbank for the mean time. so everytime he has to start the car, he uses that.

 

[PHIL O]

You are talking about the 12-24V voltage converter relay in the engine bay right? That component is not designed to be opened up and serviced, if it's broken you'd have to find a replacement or look for another solution like 12V starter conversion. There's a detailed troubleshooting section for the voltage converter relay in the engine manual you can follow to test the component itself. But since you mention that a powerbank helps with starting it sounds more like its a battery or battery connection issue. Both batteries need to be healthy in order for the 24V starting system to work properly.

Thank you HDJ80L. i bought just one battery thinking that if a jump starter could help the start battery, i thought the other was just dying out. but after some research it seems that both batteries average out in lifespan so when one goes, the other is on its way too. i am leaning towards checking the battery and connections as both you and Squash have suggested