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Electrical Problems.... ._.

 
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Old 04-14-2014, 01:58 AM
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Icon9 Electrical Problems.... ._.

Hey guys, so I've had a problem that is plaguing me

1. When everything is hooked up, the battery fuse will blow when hooking up the negetive terminal right after the positive.

2. If I disconnect the alternator ground, it does not blow. However, I don't have power to locks, windows, only 2 icons light up on the dash, no clock, no sunroof, but the light comes on for cruise control, as well as the green circle around the keyhole. Headlights still have power. Hazard lights won't come on.

3. When I turn the key to accessory (with alt. Ground disconnected), there is no power to the radio, or the above. But, the wipers turn on automatically and start going at a medium speed intermittently.
Now, it is to my understanding that the only thing running through the 100A battery fuse, without traveling through another lower fuse first is the alternator, and grounds 401, 402. Both of these grounds are fine and have good connections.



I have checked the alternator ground and it seems to be fine. I traced it back as far as i could and could not find a short. Also, I took apart my alternator, cleaned it and made sure all connections were perfect, which they are now. No other fuses are blown. I checked the dimmer relay and its fine as well.

What could this be?
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Old 04-14-2014, 09:05 AM
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Re: Electrical Problems.... ._.

This sounds like you have a ground somewhere disconnected and power is backfeeding into your system. Also, do you have another alternator you can try to see if you have an internal issue with it?
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Old 04-14-2014, 01:48 PM
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Re: Electrical Problems.... ._.

Nope I do not have another alternator. That's what I was thinking... I'll run through everything again and check.

Also there is a ground above the oil pan, and the bolt is spring loaded from the inside. What does this ground do?
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Old 04-15-2014, 10:24 AM
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Re: Electrical Problems.... ._.

Ouch! Bummer! Sounds awful.

My knee jerk reaction is a ground. Duh! First off gaze at all wires you can to ensure a rodent hasn't munched on anything. It happens more than most folks realize.

The service manual has grounds listed. But... the electrical trouble shoot manual has the system listed in far greater detail. It also lists tips and instructions for testing each and every part of the circuits. The diagrams show what ties to where throughout said circuits and shows how to isolate them.

With all that said... start out by learning where all of your grounds are. Ensure they all have proper connections and solid (as in no breaks) wire end to end. If that's not the issue, go the helms.com and buy an electrical trouble shoot manual for your car and go from there.

Best of luck.
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Old 04-15-2014, 11:30 AM
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Re: Electrical Problems.... ._.

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Originally Posted by Garurumon View Post
Also there is a ground above the oil pan, and the bolt is spring loaded from the inside. What does this ground do?

Front of the motor? Back of the motor? Sides?

I doubt it's a ground, since no grounds are spring loaded.
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Old 04-15-2014, 05:17 PM
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Re: Electrical Problems.... ._.

^^^^ pretty sure that is oil pressure sensor/switch assuming its under the oil filter
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Old 04-16-2014, 01:01 AM
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Re: Electrical Problems.... ._.

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Originally Posted by twokexlv6coupe View Post
Front of the motor? Back of the motor? Sides?

I doubt it's a ground, since no grounds are spring loaded.
Back of the motor. Right under the lower IM.
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Old 04-16-2014, 09:45 AM
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Re: Electrical Problems.... ._.

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Originally Posted by Jai_ View Post
^^^^ pretty sure that is oil pressure sensor/switch assuming its under the oil filter
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Originally Posted by Garurumon View Post
Back of the motor. Right under the lower IM.



Come to think of it..... I can't think of a SINGLE bolt on a Prelude that's spring loaded. SOMETIMES exhaust bolts have springs around them to always keep tension on the bolts sealing the flanges and gaskets, but that's only on aftermarket exhaust systems.

The only thing that's under the IM on the back of the motor is the knock sensor (if you have an H-series), and oil pressure sensor/cooler/filter.
Maybe you're confusing pressure behind the sensor pushing outwards as spring loaded?

Can't be the knock sensor since there is no pressure behind that.
And if you started undoing the oil pressure sensor with the system pressurized..... I'm pretty sure you woulda found out very suddenly not to take that out.
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Old 04-16-2014, 12:38 PM
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Re: Electrical Problems.... ._.

I'll have to take a picture for you of it. Definitely feels spring loaded, and my car doesn't have oil in it right now so I don't know how it would have pressure there!

Could a blown alternator cause these problems or does it definitely sound like a short somewhere?
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Old 04-16-2014, 02:52 PM
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Re: Electrical Problems.... ._.

Here ya go, assuming you have a H under the hood, these are the only 2 sensors/plugs on the rear of the engine- granted the knock sensor's plug is broken off you get the idea still.



the oil pressure sensor/switch is connected with a wire on an eye ring, that just bolts into it with a tiny screw, could be confused with a ground.
It does have a spring in it just like the coolant temp sensor that makes your dash read how hot/cold you're running

Hope that helps in some way..
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Last edited by Jai_; 04-16-2014 at 02:56 PM. Reason: edited..
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Old 04-18-2014, 03:52 PM
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Re: Electrical Problems.... ._.

Thanks guys :) figured out the problem. Somehow the polarity on my battery was completely reversed. Swapped out for my bros battery and bam. Everything works, fuse was blown on my stereo.
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