Posted 31 October 2006 - 12:12 PM
I'm having some trouble with with my 260z electrics. I noticed that the power was gradually leaving the car each time I tried to start it until eventually the car wouldn't start. The starter motor just didn't have enough guts to turn over the engine. I tried to jumpstart her and it fried the earthing wire. As time went on the power in the car continued to dissipate until not even the internal lights could operate. Towards the very end the car began making a hum within the cockpit and the noise appeared to be coming from the multitude of wires above the fuse box. The battery is fully charge and the power is reaching the engine too. Does anybody have any idea what might be the problem? Any help will be greatly appreciated
Posted 31 October 2006 - 01:36 PM
As far as the battery draining, what period of time was this over? If you have some more info that'd be great.
Posted 01 November 2006 - 01:18 PM
Posted 02 November 2006 - 04:05 PM
Posted 05 November 2006 - 09:27 PM
The original '77 280z's build has an external mechanical voltage regulator that is unreliable and unstable with age. It is actually based upon elements that open and close many times each second due to heating and cooling. The principal is not much different than the overheat protection devices commonly used in your toaster and hairdryer. It also requires frequent adjustments of gaps much like spark plugs.. The newer ZX alternator incorporates a built in solid-state voltage regulator that requires no maintenance and is more stable.
the ultimate upgrade is to switch to a more modern, internally regulated alternator (solid-state regulation for the win) and shunt out the connector where your old regulator is.
Benefits are a newer more powerful alternator, and no more regulation woes.
the details of the swap can be seen here.
Edit: Hum could be your amperage dropping low enough that the coils in one of the relay (just above the fusebox) rapidly switching on and off. due to an oscillating current. which if the case is sever because that is mA required to drive a relay coil, but possible. essentially the coil has enough current to engage, but as it engages there is a sudden increase in current draw (through the relay). there is no longer enough available current to hold the relay engaged, so it disengages, as this happens the current draw drops and it has enough power to engage again. repeat infinitum. sounds strange but it happens, it can sound like a hum when its happening many times a second.
suggest you check your current draw through your battery when the car is running.
Posted 06 November 2006 - 08:19 AM
Posted 27 November 2006 - 10:15 AM
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