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-   1958 To 1960 Squarebirds - General Technical Discussion (http://squarebirds.org/vbulletin/forumdisplay.php?f=14)
-   -   12V to coil? (http://squarebirds.org/vbulletin/showthread.php?t=9119)

Gold Bird 06-28-2010 08:36 PM

12V to coil?
Well, I thought the voltage was a full 12v to the coil but I tested it tonight and at idle it reads 10.5 to 11volts. Once you rev the engine it goes to 12.1 to 12.5. Must still have the resisitor wire in there? Where do I go next with this?

Gold Bird 06-29-2010 02:58 PM

Forgot to mention in the post that a few weeks ago I put in a Pertonix electronic module in the distributor and got a new Pertronix coil. I think they are supposed to have full battery voltage......

tbirds8 06-29-2010 07:44 PM

I,m thinking you are getin 12 volts. If you still have the generator on the car. I think you would be getting around 0.6 or so with the resister wire. Just my thought. Yo dave?????? Yo gary??????????

KULTULZ 06-29-2010 07:57 PM

Do you have the system wired through the IGN SW?

Is it still a generator?

Gold Bird 06-29-2010 08:40 PM

it is wired through the original ign switch but how would I know if its the orig generator? Sorry for the dumb question..

YellowRose 06-29-2010 11:42 PM

12V to coil?
Hi Tom. It is not a dumb question. The question he asked was if you were still running a generator on Gold Bird. Or are you running an alternator now? That is how I understood it.

scumdog 06-30-2010 01:32 AM

10.5 to 11 volts is enough - according to what I remember of the Petronix site.

KULTULZ 06-30-2010 05:29 AM


Originally Posted by scumdog (Post 46692)

10.5 to 11 volts is enough - according to what I remember of the Petronix site.

Most likely correct.

I asked if you had a generator as the output may be low. The PERTRONIX system is designed to work off full BAT VOLT which is ideally about 14.6V. This may be difficult to arrive at with a GEN.

But the VOLT you showed seems to be low also. Maybe check the output of the GEN and how much of that is actually getting to the BAT. The volt reg is mechanical and may need to be adjusted (see shop manual).

Ideally, this system should be supplied through a relay (to realize full benefit). The IGN SW signal activates the relay and it draws directly from the BAT.

Are you having ignition performance problems or are just concerned with low BAT VOLT?

simplyconnected 06-30-2010 12:23 PM


Originally Posted by tbirds8 (Post 46680)
I,m thinking you are getin 12 volts...

I agree. I would bet, when Tom's car is sitting (not started) the battery reads, 12-volts. Then when he starts it and idles, the generator isn't charging because its running too slow, so the battery goes down to 11.5-volts.

My understanding from my buddies (because I don't use Pertronic's) is, these electronics systems use a lot more juice than the points setup. They work far better with an alternator, just because an alternator outputs plenty of voltage at idle speeds.

I am told, the MSD system draws well over ten amps, but it adds new life to your engine.

Tom, what is your concern regarding performance? Can you tell a big difference when your car voltage drops below 12-volts? Does the engine 'miss' and run erratic?

Measure your battery as it sits (not running for a few hours). If you read under 12-volts, have the battery checked for a dead cell. The Pertronix system depends on a good battery. - Dave

YellowRose 06-30-2010 03:50 PM

12V to coil?
BTW... It was Gold Bird Tom, Jr. who asked the original question, after putting in a Pertronix system in Gold Bird.

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