Replaced the alternator on my 02 volvo vnm with a n14 today. There was what looked to be a fuseable link running between the hot and ground studs. Didnt see the point in it so left it off the new one. Battery light comes on in the dash but the computer reading says 13.5-14 volts as does my handheld at the alternator and battery. Any ideas on the purpose of the wire is and the light?
Alternator question
Discussion in 'Trucks [ Eighteen Wheelers ]' started by flatlander2010, Oct 1, 2014.
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I'm not familiar with Volvo, but could this fusable link instead be a diode?
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Possible. Just assumed it was a fuseable link.
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Why wouldn't you put it back on? If it was on originally, I'd think it probably should be on but......
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Diodes allow current to pass in only one direction.
Again, I'm unfamiliar with Volvo. Most mechanics will always replace both alternator and regulator. Some voltage regulators are bolted on to the body, and some are inside of the alternator. Something else I'd look for is a lose or broken ground wire. Most vehicles have a thick ground to the engine and one to the frame, cab, & or firewall (classic problem causing dim headlights).Last edited: Oct 1, 2014
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I think that it is a capacitor, but don't quote me on that. It is not a fuseable link if it goes from the positive to negative, it would just blow if it was a fuseable link. I don't see any purpose for a diode to be there. A capacitor to surpress noise from the alternator is the only thing that makes sense to me right now.
Heavyd Thanks this. -
GrapeApe's suggestion of a noise suppression capacitor makes the most sense. The truck battery acts like a capacitor but doesn't filter (smooth) high frequency noise. A capacitor connected in parallel will. Wonder if you have something on your truck that generates high frequency noise (pulses), like a dc-dc convertor 12 to 24, or 24 to 12?
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I have a question about grounding the alternator itself, I ran a battery cable from the ground stud of the alternator to the block, or should I have run it the the chassis(frame) instead,.. for the best ground.
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Usually the battery itself is bolted to the engine block (for starting), with others to the cab and frame.
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