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halfsek
Joined: 05 Sep 2021
Posts: 5
Location: Ferndale, WA
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 Posted: Tue Jun 07, 2022 2:26 pm Post subject: Voltage to ignition coil? |
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When measuring the voltage at the wires feeding the ignition coil (while they’re not connected) I’m getting around 9 volts. After they’re connected I get just over 3 volts. Brand new coil with claim it fits my car.
Battery is charged and only a few months old.
Any thoughts as to why there is voltage loss after the wires get connected?
‘79 924 |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Tue Jun 07, 2022 10:49 pm Post subject: |
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You ever clean the ends of your fuses and the terminals they mate with?
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80 Turbo - Slightly Modified |
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halfsek
Joined: 05 Sep 2021
Posts: 5
Location: Ferndale, WA
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| Posted: Tue Jun 07, 2022 11:07 pm Post subject: |
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| Fasteddie313 wrote: | | You ever clean the ends of your fuses and the terminals they mate with? |
Haven’t gotten around to the fuses yet. This is my project car to learn about cars, so I’m working my way over the whole thing. So far have just gotten it to turn over (although starter needs work now).
You think it might be a fuse issue regarding the voltage loss? |
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Wed Jun 08, 2022 1:15 am Post subject: |
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I think it’s likely a poor/corroded connection issue somewhere..
I suggest cleaning all of your fuse contacts and ground crowns under the dash and in the back by the left tail light under the carpet also..
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80 Turbo - Slightly Modified |
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halfsek
Joined: 05 Sep 2021
Posts: 5
Location: Ferndale, WA
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| Posted: Wed Jun 08, 2022 2:28 am Post subject: |
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| Fasteddie313 wrote: | I think it’s likely a poor/corroded connection issue somewhere..
I suggest cleaning all of your fuse contacts and ground crowns under the dash and in the back by the left tail light under the carpet also.. |
Thanks for that, it’ll be next on the list. |
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kondzi
Joined: 02 Jul 2018
Posts: 494
Location: Poland/EU
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| Posted: Wed Jun 08, 2022 5:04 am Post subject: |
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Well... Induction coil is not to be measured / expected to have like stable +12V.
There are cables connected, but these do "work" only when charging / discharging the primary coil circuit, that again magneto-electrifies secondary coil circuit that fires the spark when the voltage is removed from the primary coil.
Having said that one of the terminal is usually marked as "15" other as "1". The 15 is an ignition switched +12V (or less, like when a ballast resistor is used) the other one is "grounded" by distributor contacts (ignition points) / ignition module when spark needs to fire.
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded) |
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