gen 1 light and gen 2 sometimes

[paraclete comes]

Ok before you all crucify me for yet another gen 1 or gen 2 light let me explain. I have an 09 and its giving me some trouble with the gen 1 and 2 when driving with the accelerator depressed.

I have replaced alternators a couple days ago with rebuilds from rareelectric or someone off ebay, very nice looking and yes isolated ground. I have replaced batteries with some dekas and have two red tops on stand by also. But my gen 1 light stays dim and while im driving lights up or flikers, sometimes the gen 2 comes on and flashes also. Additionally the volt meter is into the red, like right at the base of the red and creeps up into the high red as i use more gas pedal.

Ive checked the tightness of the belts, I have checked the voltage on the batteries, I have trouble shot using the tm's, etc. My next shot is the two relays for gen 2 and volt meter and the heater fuse as well. I have read posts here for hours and not able to fix this yet, used google as well to no avail.

One other thing of note is that when I have my battery tester checking the batteries the front battery comes back as voltage unstable and wont give me a good analysis of the battery. Thought this might help, but any advice is much appreciated and please excuse me if this is covered elsewhere, but im having a hard time getting to the bottom of this one.

 

[paraclete comes]

ok so more details. after hooked up the pulsetech analyzer.

-cranking volts 11.23 normal
-alt idle 14.67 high
-ripple detected .12v normal
-alt load volts 14.43v high

Any ideas guys?

 

[paraclete comes]

anyone got any ideas? Im throwing in the red tops today to see if that helps the situation and pulling the trigger on the relays at cucv electric.

 

[Barrman]

Swap in the batteries, clean and check terminal wires along with the connections on the firewall bus. Then test again. Tell us what you have.

It reads like a few loose connections or a bad voltage regulator on one or both alternators.

 

[paraclete comes]

ok will give it a shot, it has new terminal as of a few months ago but the original gov cables. Thanks for the input

 

[mistaken1]

Grounds. Be sure to check/clean the grounds as well.

 

[paraclete comes]

ok update. I put the optimas in and had same results. I also cleaned pretty much every ground I could find with a wire brush lots of dirt and stuff. Fired the truck up a few times, volt meter stays in green for fifteen seconds than all the way up into the red.

 

[Cucvnut]

so its over charging now? i think u need your alts looked at.

 

[paraclete comes]

cucvnut, maybe. Im looking into that contacted the folks from ebay but brand new delco remy rebuilds. Is there anything else in these trucks im over loking that may regulate voltage? I just cant think of anything else

 

[paraclete comes]

got an email back from the alt seller on ebay, will update when I speak to them on the phone tomorrow hopefully

 

[paraclete comes]

alts

called Autozone they test alts outside the vehicle, so Im going to give that a shot see if it shows the alt as the issue alone or if I can narrow it to the truck. I hope this is simple and the alternator and not another issue within the truck as Im out of ideas on the truck.

 

[paraclete comes]

Ok so went into Autozone this morning and they tested both alts for me, guy had no idea what an isolated ground alt was. But hooked it up, both passes using the large positive and negative stud, but when he hook it up to the isolated ground FAIL Is this normal? Is there some better way to test isolated ground or are these just remanufactured incorrectly?

 

[paraclete comes]

ok after cleaning everything up gen one and gen two lights no longer flash red or come on during driving but volt meter goes into red about fifteen seconds after start up. any thoughts?

 

[cpf240]

ok after cleaning everything up gen one and gen two lights no longer flash red or come on during driving but volt meter goes into red about fifteen seconds after start up. any thoughts?

Perhaps the resistor on the back of the volt meter is out of spec? I think it is supposed to be 300 ohms, but don't quote me on that...

 

[paraclete comes]

I have heard about the volt meter resistor before and looked for it on the back where everyone mentions it is located. I have also removed my entire dash and cluster to do bulbs on two m1009's and not seen anything except the actual voltmeter and the little bracket that holds it in. Am I missing it completely or is it just located within the voltmeter? Would I need to remove the volt meter from the panel to get a peek at it? I will google and try to find a picture somewhere.

Perhaps the resistor on the back of the volt meter is out of spec? I think it is supposed to be 300 ohms, but don't quote me on that...

 

[Hasdrubal]

Heres a pic, its on the back of the voltmeter.

 

[paraclete comes]

Any idea of where a guy can pick one of these up? Or is the only option to buy a new volrmeter and if yes to the new volt meter any suggestions guys on where to buy a new one? I have googled and checked cucvelectric to no avail.

thanks for the assistance gents

Heres a pic, its on the back of the voltmeter.

 

[cpf240]

There was a post where an SS member bought 3 100 ohm resistors, from a place like Radio Shack, and hooked them up in parallel to get 300 ohms.*

For the whole gauge, I'd check the classifieds here. I have seen them on that auction site every now and then. There is also a vendor on SS, Hillbilly Wizards or something like that, and they probably have one for you.

*Assuming my memory on the values is correct...

 

[paraclete comes]

There was a post where an SS member bought 3 100 ohm resistors, from a place like Radio Shack, and hooked them up in parallel to get 300 ohms.*

For the whole gauge, I'd check the classifieds here. I have seen them on that auction site every now and then. There is also a vendor on SS, Hillbilly Wizards or something like that, and they probably have one for you.

*Assuming my memory on the values is correct...

I will check the radio shack today and look into the other mentioned options also, thanks