79 monte courtesy fuse keeps blowing

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: November 13, 2011 at 2:03 AM / IP Logged

I was gonna say an old blown fuse with wire extensions. ( <-- FULL STOP.)

Then plug in test lamps, or ammeters...

Those fuse-ammeter adaptors cost a fortune - though they do have a series fuse to replace the original fuse, or protect the ammeter (ie, usually 10A), but that is easy to add.

A shunt can be used for higher Amperages.

tony_ss

Member - Posts: 20

Joined: September 13, 2011

Posted: November 13, 2011 at 9:07 AM / IP Logged

oldspark wrote:

No - provided the bulb is rated less than the circuit eg, 10A fuse => 13.8V x 10A = 138W bulb.

But a 3W or 23W bulb will pass a maximum of 1/4A or 2A - neither of which is likely to melt a wire.

Thinks of the lamp as a current limiter.

The brightness depends on the circuit impedance.

If a dead short or maybe a starter motor solenoid, the lamp sits between +12V <whatever> and 0V (GND) and hence lights fully.

It will be dimmer for less than a short. EG if another 23W bulb, each will be the same ~half brightness. If a radio, it probably won't light.

thanks I will try this.

Alot of the info is new to me, so I'm still researching and trying to find time to diagnose it further..

thanks again for the help everyone.

tony_ss

Member - Posts: 20

Joined: September 13, 2011

Posted: November 14, 2011 at 1:10 PM / IP Logged

What about using a short circuit detector / finder? Like this?

http://www.amazon.com/Tool-Aid-SGT25100-Short-Finder/dp/B002XMUGZC/ref=pd_sim_sbs_auto_4

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: November 14, 2011 at 4:01 PM / IP Logged

Or one up - the SGT25300 (for intermittents).

If the distance ranging works ok, it might be an advantage.

Otherwise it's no different to a test light. (I've used a stop/park lamp assembly.)

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: November 15, 2011 at 7:06 AM / IP Logged

Expensive waste of money if this is a one off job.

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79 monte courtesy fuse keeps blowing

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