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08-12-2017, 03:20 PM | #1 |
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37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
Hi I have a 37 coupe V8 that was running fine on 6v. I put a 12 volt battery in, changed the cables to neg ground, put in an alternator not hooked up yet--, changed to a 12 volt coil, I ran a wire from the pos battery to the pos side of the coil to test start. it acts like it is running on just a few cylinders, it will sputter for 30 sec and die. Do I need a ballast resistor? ...not sure why it isn't running like before. I'm upgrading this so I can put in better lighting, stereo, electric radiator fan... Thanks for any help... Crandall
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08-12-2017, 04:24 PM | #2 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
Points and condenser are happy on 6 volts and probably unhappy getting 12.
toasted condenser and pitted points oops. Resistor! Some coils have a built in resistor, sme don't Check instructions. |
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08-12-2017, 04:54 PM | #3 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
The coil instructions will say whether or not you need a ballast resistor. I don't think points care what voltage things are but they do care about a functioning condenser. I'm not sure if a condenser cares about voltage...someone else will chime in on this issue. If you fried the condenser then that may be your problem. Take a look in your distributor and await responses from those who know.
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08-12-2017, 05:32 PM | #4 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
I replaced the condenser, points look fine... but still runs terrible, I'll put in a ballast now and let you know.
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08-12-2017, 05:43 PM | #5 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
You want about 3.5 ohm total resistance of the coil and the resistor. Measure across the + and - terminals on the coil with the meter and add a resistor to make up the difference.
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08-12-2017, 06:00 PM | #6 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
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08-12-2017, 07:35 PM | #7 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
ohms show 1.9 on the coil
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08-12-2017, 09:11 PM | #8 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
The ignition wires are cloth, I'm wondering if it is bleeding those wires
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08-13-2017, 07:27 AM | #9 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
If you replaced the condenser the new one may be bad.
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08-13-2017, 08:38 AM | #10 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
1.9 ohm tells us it´s not a stock non ballast coil.
So get a non ballast stock coil...or find the ballast resistor for that coil. |
08-13-2017, 08:45 AM | #11 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
If you are adding a ballast resistor it needs to be in the 1.1 to 1.6 ohm range. However, the ballast resistor is more of a long term thing and probably not the cause of the immediate problem.
Here’s some commonly available automobile ballasts available from NAPA: •#ICR23 – 1.20 ohms •#ICR11 – 1.35 ohms •#ICR34 – 1.40 ohms •#ICR37 – 1.60 ohms •#ICR35 – 1.80 ohms •#ICR13 – 1.82 ohms |
08-13-2017, 12:26 PM | #12 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
I picked up a NAPA ICR23 1.20 resistance bringing my coil to 3.2 --- I also took the wires out of the metal tubes-- it still runs very rough backfiring a bit. won't stay running. noticed the ballast gets very hot, probably normal due to it's cased in ceramic . I appreciate all the help. I will get another ballast to get it to 3.5.... Any thoughts on the 932-41 Ford Flathead 3 Bolt Electronic Distributor "ready-to-run" unit that does not require a control box?
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08-13-2017, 12:49 PM | #13 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
If it quits after just a short period of time there must be some other issues...
Running a coil to hot for a while shouldn´t make it sputter and die. Either coil/points/capacitor is bad... or you have fuel issues. I would start checking that you have enough fuel before changing to electronic ignition. |
08-13-2017, 12:53 PM | #14 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
I will check the fuel
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08-13-2017, 01:19 PM | #15 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
Firing order?
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08-14-2017, 11:04 AM | #16 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
the fuel is not the problem, fuel bowl is full, and it is pumping fuel fine, it is mis-firing-- wires are solid core copper and cloth, I get shocked by just putting my finger close to the wire. will change the wires
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08-25-2017, 12:13 AM | #17 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
UPDATE.... it is alive... The new condenser was bad. I borrowed one off my Subaru 360 Truck, and it started right up.. Also the cloth wires were occasionally sparking in the metal tubes so I replaced them with solid core 7mm.
Few notes if you are doing a conversion from six to twelve. 1. Use a single wire alternator.. one wire goes directly to the battery ---That's it--- it eliminates many wires.... 2. Starter will still turn correctly when you switch to negative ground 3. I was going to go to electronic ignition, but stayed with the stock 2 cap distributor... I lucked out because it had a blue Bubba's sticker on it. Thanks for all the advice. I really appreciate it. Tom |
08-25-2017, 12:34 AM | #18 |
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Re: 37 coupe V8 running rough after a 6 to 12 volt and pos to neg ground conversion
Good hearing you got it up and running.
Routing the cable directly from alternator to battery isn´t the way you should do it if you want your amp meter to work as it is intended to. Connect it to the "fuseblock" under the dash instead. |
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