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Username Post: Battery drain 69 c10        (Topic#366865)
Granatam 
Newbie
Posts: 7

Reg: 11-05-21
11-05-21 12:08 PM - Post#2830272    

New externally regulated alternator. New regulator. Charging voltage is 14.5v. Turn ign off and there is a 4 amp drain. Disconnect regulator and drain drops to 6 mA. Plug regulator back in and drain goes to 4A. Disconnect blue and white wire at alternator and drain drops back to 6mA. Stumped



 


Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-05-21 12:45 PM - Post#2830274    
    In response to Granatam

I think that the draw has nothing to do with the regulator - 4 amps is pretty large and it has to be an accessory that isn't powering down. Check with amp meter to see which wire is getting the draw.



 
Granatam 
Newbie
Posts: 7

Reg: 11-05-21
11-05-21 12:52 PM - Post#2830276    
    In response to Mercedes

We did a parasitic test by pulling fuses etc and no change to the 4 A. Only dropped when we disconnect the blue and white wires at the alternator



 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-05-21 01:36 PM - Post#2830285    
    In response to Granatam

What I am describing is to put an amp clamp around wiring harnesses to find the draw, then around each wire one at a time until you find the wire with the draw.

Then, go to the wiring diagram and see what is on that circuit.

Have you ever checked the ignition circuit?



 
Granatam 
Newbie
Posts: 7

Reg: 11-05-21
11-07-21 07:37 AM - Post#2830358    
    In response to Mercedes

We are thinking the brown wire from the voltage regulator was miswired to the ignition switch always hot vs to the switched side so when the key is turned off the brown wire is still hot



 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-07-21 08:46 AM - Post#2830371    
    In response to Granatam

Check for a worn out ignition switch, too.



 
Granatam 
Newbie
Posts: 7

Reg: 11-05-21
11-07-21 01:47 PM - Post#2830392    
    In response to Granatam

Took a measurement of voltage at pin 4 (brown) of the voltage regulator connector with the key in the OFF position and we are measuring 12.7 volts. Bingo,,! Thinking that there is a miswiring issue between the fire wall and the ignition switch. Sound real.?



 
Mercedes 
Contributor
Posts: 539

Reg: 07-09-18
11-07-21 03:10 PM - Post#2830399    
    In response to Granatam

Get the wiring diagram for your vehicle.



 
Granatam 
Newbie
Posts: 7

Reg: 11-05-21
11-08-21 03:33 AM - Post#2830427    
    In response to Mercedes

Thanks for all of your help. We’ve narrowed it down to the ignition switch



 


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