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Blowing ignition fuses

For all things Electrical.

Moderator: -Scott-

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Posts: 813
Joined: Wed Aug 18, 2004 10:21 pm
Location: Hobart

Blowing ignition fuses

Post by Spike_Sierra »

today was driving, and car died.
this had happened before so i checked the ignition fuse and sure enough blown.
fair enough, shit happens, put another fuse in, zap. gone again.
bugga.
so later on tonight, i connected a wire straight from coil to battery +ve, disconnected any other wires leading to the +ve of the coil.
still no go, connected the wires back up, put a fuse back in, still no go.
took out spark plug, no spark.
im thinking stuffed coil, and was on the way out when it was blowing the fuses.
anyone got some thoughts
85 LWB w. FRP Canopy
Ca18det conversion in progress, Vit PS, RUF,
6.5:1's, 33x12.5 Bfg's, custom front and rear bars.
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mav
Posts: 320
Joined: Thu Jun 26, 2003 1:53 pm
Location: traralgon victoria

condensor

Post by mav »

hi it is a dissy with points you are talking about? sounds like the condensor to me or the wiring has shorted or like you said the coil but the condensor is cheaper than a coil and what i think it is.
see ya mav
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Joined: Wed Aug 18, 2004 10:21 pm
Location: Hobart

Post by Spike_Sierra »

anyone else, im hopefully putting in another coil today, should it matter that its off a 120y and not a sierra?
this condenser you talk off, im guessing its the little thing that comes off the coil about 1cm diamter thingy?
what does it actually do?
85 LWB w. FRP Canopy
Ca18det conversion in progress, Vit PS, RUF,
6.5:1's, 33x12.5 Bfg's, custom front and rear bars.
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Location: Adelaide

Post by -Scott- »

The condenser is another name for a capacitor, and your coil is an electrical transformer.

An ignition coil creates a collapsing magnetic field when the current in the primary coil is suddenly stopped. This collapsing magnetic field induces a huge voltage in the secondary coil, which makes the spark in your spark plug.

The collapsing magnetic field in the primary coil also tries to keep the current flowing in the primary coil, which causes sparks across your points contacts and burns them out in one hell of a hurry. The condensor creates an alternative path for this arcing current, and helps protect your points contacts.

If your condensor doesn't work properly you can have miscellaneous ignition problems, but I wouldn't have expected blowing fuses. Which is not to say it couldn't happen.

Cheers,

Scott
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mav
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Joined: Thu Jun 26, 2003 1:53 pm
Location: traralgon victoria

condensor

Post by mav »

with out your condensor you will find your car won't run, replace it first as they are cheap.
see ya mav
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Joined: Mon Aug 09, 2004 9:32 pm
Location: Ipswich

Post by 92mav »

my hilux was blowing the ignition fuse due to a short in the reverse light circuit
GQ TD42, 4" lift, 2" bodylift, 4.6 s, detroit lockers, 35,s t3/t4 plus a turbo,
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Post by Spike_Sierra »

fixed it,
it was the coil on the way out,
found a coil in the shed from and old 120y stuck her in and she goes like a dream!
thanks all
85 LWB w. FRP Canopy
Ca18det conversion in progress, Vit PS, RUF,
6.5:1's, 33x12.5 Bfg's, custom front and rear bars.
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