Electrical Grounding

[Bitsyncmaster]

I'm remember the old post also. From what you describe it does sound like a ground issue. Sounds like your engine block ground is faulty (weak). I would add a second engine block ground.

But if the engine block ground were were bad I would think your starter would have problems. Maybe the left cylinder head has the bad ground.

[Regulus]

I would just like to verify that your battery light in the instrument cluster is or is not LED?

It should not be LED.

Correct, Battery light is incandescent.

[Regulus]

I'm remember the old post also. From what you describe it does sound like a ground issue. Sounds like your engine block ground is faulty (weak). I would add a second engine block ground.

But if the engine block ground were were bad I would think your starter would have problems. Maybe the left cylinder head has the bad ground.

I thought the entire block used the same grounding strap (by the right side of the frame). Do the two engine banks ground separately?

[Bitsyncmaster]

I thought the entire block used the same grounding strap (by the right side of the frame). Do the two engine banks ground separately?

It should only take one ground strap for the whole engine. But yours is an unusual problem. The block depends on all the bolts making the metal all one conductor. The paper gaskets would separate the aluminum.

I did put another ground wire (#4 AWG) on the drivers side like the passenger side OEM strap. I did not have any problems but thought it was a good idea.

[DMC3165]

I have a similar problem lately. I'm not sure if its the same as the OP but when my A/C compressor comes on with the lights on as well the voltage drops way down. The needle hangs just above the high red line. It's not the fans. If the fans come on without the A/C the voltage drop is noticeable but minimal. Could it be a ground issue with the engine or the compressor?

[82DMC12]

I have a similar problem lately. I'm not sure if its the same as the OP but when my A/C compressor comes on with the lights on as well the voltage drops way down. The needle hangs just above the high red line. It's not the fans. If the fans come on without the A/C the voltage drop is noticeable but minimal. Could it be a ground issue with the engine or the compressor?

That sounds more like a weak alternator. Which one do you have? Cleaning all the ground could help but if you have a weak alternator it really should be replaced.

Andy

[Bitsyncmaster]

Does it help when you give it a little gas?

[DMC3165]

That sounds more like a weak alternator. Which one do you have? Cleaning all the ground could help but if you have a weak alternator it really should be replaced.

Andy

It's a Hervey 90 amp I put in last November. Everything is ok while driving or idling without the air on.

Does it help when you give it a little gas?

Yes. If I'm sitting at a light speeding up the motor brings up the voltage.

[Bitsyncmaster]

It's a Hervey 90 amp I put in last November. Everything is ok while driving or idling without the air on.



Yes. If I'm sitting at a light speeding up the motor brings up the voltage.

Do Your idle RPMs hold the same with or without the AC on?

Your alternator may be weak or a bad connection. Try cleaning up the bolts holding the alternator onto the engine.

[DMC3165]

Do Your idle RPMs hold the same with or without the AC on?

Your alternator may be weak or a bad connection. Try cleaning up the bolts holding the alternator onto the engine.

Yes the Rpm are the same at idle. I will check the connections this evening.