Starter Wiring

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
rrcrusher4321
Posts: 8
Joined: Sat Nov 05, 2022 7:06 pm
Car: 1991 Nissan 240SX SE Hatch

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Took off my starter on 91 Hatch but the small wire to the starter solenoid broke off, leaving a small bit of metal exposed on the wire and the rest stuck on the post of the solenoid. Any advice, does anyone sell a wire that would fit this did a quick search and only saw a s*** slightly different one on eBay. Not sure how to add a picture or I would.


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NukeKS14
Posts: 310
Joined: Wed Apr 10, 2019 2:50 pm
Car: '95 Nissan 240SX SE KA24DE-T
AC Cobra Mk IV Rep.
2020 Honda Civic Si

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Here's the starter. So is the wiring in-tact at the starter? just the harness side connector came apart?

Image

This is the what the harness side connector looks like. This is what plugs in to the starter signal connector (female) on the starter. if THAT is what came apart you can get a new one here and just splice it into your existing wire;
Image
https://www.wiringspecialties.com/ka24- ... connector/

If it's the other way around you'll have to find a way to disassemble the connector and try to re-connect it back to the starter. Or buy a new starter but that's the expensive way around. That wire doesn't carry much current at all.

rrcrusher4321
Posts: 8
Joined: Sat Nov 05, 2022 7:06 pm
Car: 1991 Nissan 240SX SE Hatch

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It was the signal connector wire but it broke where it connected to the starter solenoid, not where it connects and reconnects to itself, I just got a new connector (dont know exact name) that looked like this, Image
and crimped it where the broken one was. It still won't start, the battery reads a good 12v when the negative terminal is disconnected, but as soon as i put the negative terminal on it drops to about 2V and slowly trickles down from there. Is this an issue with grounding somewhere or in connections or something else. I'm somewhat stumped right now, electrical stuff is my bane, any advice helps out thanks.

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VStar650CL
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Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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There's no way even a shorted starter can suck a healthy battery to 2V without starting a fire. You either have a crapped-out battery or resistance someplace in the hot cable, probably right at the battery lug.

rrcrusher4321
Posts: 8
Joined: Sat Nov 05, 2022 7:06 pm
Car: 1991 Nissan 240SX SE Hatch

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I've cleaned out a bunch of connections and cleaned all the grounds, and recharged the battery, it drops 0.1-0.2 volts when I connect the negative terminal. On the positive terminal, there is a red connecter that has two connecters plugged into it, one of the connectors being black with a single white cable out of it and the other being a green connecter with two white wires coming out of it. Both of these connectors look to run into the closest fuse box right next to the battery. The black connector with the larger single wire is shorting to ground, while the main hot wire and other green connecter are seemingly fine. I've found that when I take off the 75A fuse in the fuse box labeled alt it stops the short there and doesn't go all the way to the connector on the positive terminal but the fuse is good after testing it. This is making me think it may not be the starter as in my head (in not sure) the starter positive is fed directly from the main hot wire not the connector. My question is what is this shorting line going to, is it simply just the alternator, or is the black connector coming from the red thing on the positive terminal linked to more than just that inside of the fuse box. I'm pretty stupid when it comes to electric work and circuits so anything will help out thanks.

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VStar650CL
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Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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The battery still shouldn't be sucking down as soon as it's connected, even if there's a dead short someplace. The biggest load onboard is the starter at about 150A, and that will only draw the battery down to about 10V. Are you sure your battery is any good?

rrcrusher4321
Posts: 8
Joined: Sat Nov 05, 2022 7:06 pm
Car: 1991 Nissan 240SX SE Hatch

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The battery is about 2 months old and passed a simple voltage and load test so I'm thinking it is, it has 12.6V between terminals dropped to about 12.45 when negative attached, and to 12.35 when turning key over. I'm still going to take my battery up to an AutoZone and have it tested to make sure but from what I've seen and know the battery is good.

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VStar650CL
Technical Expert
Posts: 11916
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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You're confusing the issue, then. You said this above:
"the battery reads a good 12v when the negative terminal is disconnected, but as soon as i put the negative terminal on it drops to about 2V and slowly trickles down from there."
So evidently you're not measuring the battery as that quote implies. Exactly where are you measuring?

This might help you out:
https://www.nicoclub.com/archives/under ... tests.html

rrcrusher4321
Posts: 8
Joined: Sat Nov 05, 2022 7:06 pm
Car: 1991 Nissan 240SX SE Hatch

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I am measuring right on the battery posts, it was dropping to 2V (from positive battery post to negative battery post) and even less but after cleaning up a bunch of wiring, connections, grounds, and charging the battery, it would still drop slightly about 0.2V to about 12.4V with a slow parasitic loss. It's not dropping to 2V anymore but was. My neighbor that work with electrical I think an electrical engineer looked at it yesterday and was saying it was real weird, but we couldn't figure it all the way out just finding the short to ground in one of the cables connecting to the red connector on the positive terminal.

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VStar650CL
Technical Expert
Posts: 11916
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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If you're measuring at the posts and not the connectors, then it sounds like you have a broken post or separated plates inside your new battery. Back to my original assertion, there's no way even a shorted starter can suck a healthy battery to 2V without starting a fire. When shorted, a battery will deliver its full rated CCA, and 500~800A is guaranteed to heat something up. The fact that it drops so low without smoking anything can only mean the battery isn't delivering any current.

If you're measuring at the connectors and not the posts, then I'd say it's likely you have a crap connector. Use voltage drop to find out where the juice is going away.


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