I have 2 ballast resistors. They are in Delco boxes. Part # 1957154. Both have a blue line on them. The one has Hurst mfg corp indiana on the flat part of the clamp between the area wire the screws are for the wires. This one appears to be older. The other resistor has Delco remy usa on the area where it mounts to the firewall. This style did not judge correct. How do you tell if they are orignal and will pass judging and not a service part? Thanks Mike
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Re: C2 Ballast Resistor
Mike M.
Where did you get them? Sorry I can't answer your question but was interested in what the values might be for 63 (resistive values that is)?
Mine looks original and I expect it to quit by the time I restart my car in 05' Are they something you can get from GM? Are the values the same up until they went to resistor wires? Any info would be appreciated, Thanks
Mike S. -
Re: C2 Ballast Resistor
Michael, I've had these for a few years now. As far as I know GM discontinued and the repo's I've seen are not very good. I think they either work or they don't. I'm not sure what the resistance is, I can put my meter on one and let you know unless someone comes on here and states it.
I'm wondering what a orignal looks like. If anyone has a picture could they email it to me. MikeComment
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Re: C2 Ballast Resistor
I won't comment on the color I.D., as there doesn't appear to be agreement on that issue. The latest reproduction (Paragon) is about as close to an original as I've seen except for a couple of very minor deviations, and measures 2.0-2.1 ohms vs. the 154's spec of 1.8 ohms. The one you describe that says "Hurst" on it is clearly not OEM.Comment
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Re: C2 Ballast Resistor (and Q)
Michael -- '63 Corvette 1st design (exc. Sp.H/Per., F.I.) as well as '63-'64 (w/Sp.H/Per., F.I.) used #1931385 black dot ident., 0.3 ohms [Delco D-1111].
'63-'64 (2nd design) (exc. Sp.H/Per., F.I.) and '65-'67 (exc. T.Ign.) uses #1957154 [Delco D-1110] blue stripe, 1.8 ohms. I believe the 1st to 2nd design changes were in conjunction with ignition coil revisions.
GM catalogs show as such at least from '65 thru '70.
Here's my question: picked up a Delco original off a scrap yard donor, from a non-Corvette (they were used widely on other cars) and someone had sprayed the firewall in black lacquer. Of course, removing this from the ceramic destroys the dot or strip identification. Can you determine the 1.8 versus 0.3 ohm differences from counting the number of resistor coils embeded in the ceramic ? No way my cheap ohm meter can read down this low.Comment
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Re: C2 Ballast Resistor
OK I need some education . A ballast only changes 12V to 8V (any 50's or 60's) and that that. Am I right?????? what dose value have to do with it????Comment
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Re: C2 Ballast Resistor (and Q)
Just measure them with a digital ohmmeter.
All early '63 engines used the 0.3 ohm ballast with the 091 coil, but a running change substituted the 1.8 ohm ballast and 087 coil on 250/300 HP engines. The 0.3 ohm/091 coil continuned on SHP/FI engines through '64.
The 63-64 JG has this wrong. The AIM is right and is backed up with a TSB.
DukeComment
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Re: C2 Ballast Resistor
A ballast is present in 12V aplications to add a series resistance to the coil primary resistance, which cuts reduces primary current. The 0.3 ohm ballast allows more primary current, but this caused point burning problems especailly in cold weather. The ballast resistance increases with temperature, so it provides current limiting when things get hot.
The late Dale Pearman used to go into long explanations of how the ballast was an "analog computer", and he was correct, though his explanations were sometimes a bit convoluted.
My previous post offers the ballast/coil combintions for 63-64 engines. (The 0.3 ohm ballast was not used as OE after '64.) I believe that many more of the pre-'63 engines used the 0.3 ohm ballast, and you should refer to the appropriate AIM to see which one was used for your specfic application.
DukeComment
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Re: C2 Ballast Resistor
Mike,
Duke is correct in his answer. A TSB was issued on Feb, 27, 1963 regarding premature points burning in cold weather with the "Black Dot," 0.3 ohm ballast resistor.
The "Blue Stripe," 1.8 ohm was substituted for use on Feb. 4, 1963 for all
250 / 300 hp Corvettes and 340 hp, 409 passenger cars.
The 1.8 ohm could also be used on 340, 360, 400 and 425 hp 409's and the Corvair
Spyder for temporary winter use.
Hope this helps.
Lane
#38102Comment
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Hurst Ballast Resistor
John the hurst resistor came out of a Delco box and the name hurst is the only difference I can see between the 2 that I have. Must have been a service replacment part.
Thanks JohnComment
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Re: C2 Ballast Resistor
Could the D1110 "black dot" resistor be used with a distributer that has been converted to breakerless ignition. Thanks.Comment
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Re: C2 Ballast Resistor
Depends which conversion you have - some want a full 12 volts (like Pertronix), some want less; check the installation instructions or with the manufacturer's tech line.Comment
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