Alternator & the Load Dump Module
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Alternator & the Load Dump Module
Howdy all. I’ve got an 88xjs. The battery light has been blinking on/off. Whenever I hit accelerator it comes on. When I hit brakes, it goes off. That said, the battery gauge always stays at the high level
I’ve been told I need to replace the alternator & the load dump module. The module is hard to find and costs 2X the cost of the alternator.
Ive been reading many posts about bypassing the load dump module, but no one has said what the downside of doing this is. How does bypassing the module affect the alternator and/or battery? If I replace the alternator do I have to replace the module? How do I know whether I need to replace the alternator, the module or both?
Thank you very much
I’ve been told I need to replace the alternator & the load dump module. The module is hard to find and costs 2X the cost of the alternator.
Ive been reading many posts about bypassing the load dump module, but no one has said what the downside of doing this is. How does bypassing the module affect the alternator and/or battery? If I replace the alternator do I have to replace the module? How do I know whether I need to replace the alternator, the module or both?
Thank you very much
Last edited by VadimP; Oct 11, 2018 at 12:13 PM. Reason: Adding info
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From: Vic Australia
Firstly you need to determine if the problem is the alternator or battery, as the light will come on if either are bad.
Battery voltage with it disconnected should be at least 12.8v no less.
Re connect the battery and start the car measure voltage on the battery it should be about 13.8v, rev the car and the voltage should remain reasonably stable it may go up to 14v.
Next put your meter on AC volts and measure at the battery with the car running AC volts must be less than 0.5v
Battery voltage with it disconnected should be at least 12.8v no less.
Re connect the battery and start the car measure voltage on the battery it should be about 13.8v, rev the car and the voltage should remain reasonably stable it may go up to 14v.
Next put your meter on AC volts and measure at the battery with the car running AC volts must be less than 0.5v
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I'm sure I've read where others have bypassed/disconnected the dump module with no ill results....but I can't find or remember where.
It's supposed to protect against voltage spikes under xxx-circumstances; I think it was introduced along with Marelli igntion.
Cheers
DD
It's supposed to protect against voltage spikes under xxx-circumstances; I think it was introduced along with Marelli igntion.
Cheers
DD
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Firstly you need to determine if the problem is the alternator or battery, as the light will come on if either are bad.
Battery voltage with it disconnected should be at least 12.8v no less.
Re connect the battery and start the car measure voltage on the battery it should be about 13.8v, rev the car and the voltage should remain reasonably stable it may go up to 14v.
Next put your meter on AC volts and measure at the battery with the car running AC volts must be less than 0.5v
Battery voltage with it disconnected should be at least 12.8v no less.
Re connect the battery and start the car measure voltage on the battery it should be about 13.8v, rev the car and the voltage should remain reasonably stable it may go up to 14v.
Next put your meter on AC volts and measure at the battery with the car running AC volts must be less than 0.5v
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From: Vic Australia
I would not worry about the load dump module, just disconnect it, the battery will act like a large capacitor to regulate voltage spikes.
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