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INSTRUMENT PANEL[700/91] posted by Rich Gibbons on
Wednesday, 17 February 1999, at 7:58 p.m.
I am having a problem with my '91 Volvo 740. I removed the instrumentation
panel, so I could send it out to have the speedometer repaired. Three days
later, the battery has gone dead (It was replaced a month ago). Is there a
connection between having the instrumentation panel removed and the battery
going dead? Please respond with any suggestions. Thank you.
- Richard F. Gibbons
Re: INSTRUMENT PANEL[700/91] posted by abe crombie on
Wednesday, 17 February 1999, at 11:16 p.m.
I will assume that you are driving the car w/o the cluster in it.
The alternator relies on the warning lights in the cluster to complete a circuit to ground in order to provide an initial current feed to magnetize the rotor in alternator. W/o this being magnetized the alternator will not charge unless you rev it up to 4000 or more RPM at which time the very faint residual magnetism in rotor will create enough current flow in alternator for it to begin to charge.
If you were to place a regular test probe test light between the red wire and ground it would serve as a feed to get it to charge.