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  #1  
Old 11-01-2010, 04:17 PM
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CardinalFJ60 CardinalFJ60 is offline
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Default FJ40 gauge cluster - clustered?

So...I finally got around to putting in the new(used) guages and putting the cluster back together. I was careful to tape up the Ammeter posts so I wouldn't re-fry it. BUT...upon connecting everything and just placing it back in the dash, I touched the circuit board to the metal and it started sparking (!) Now the instrument lights are always on, but turn off when I hit the headlights, and one blinker indicator is always on. I can see where I fried the board. guages seem to all work. that's the carnage.

Here are my questions:
Is that whole circuit board live when connected? I can't imagine it is. If not, then something else must be going on.(?)
What's my next step? get a new printed board?
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Old 11-02-2010, 10:33 AM
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Yes, there is unswitched power available - for example, on a 40 you can turn the headlights on without the ignition key turned on. This illuminates the cluster lamps too.

Whenever working with the cluster on a 40, it is VERY IMPORTANT to disconnect the negative terminal at the battery!
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Old 11-02-2010, 11:33 AM
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Bummer - bitten twice. I still haven't mustered up the energy to replace my ammeter since I zapped it a couple years ago.
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Old 11-02-2010, 11:50 AM
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Default Totally.

twice bitten...thrice shy. I guess I just couldn't imagine the whole back panel would be 'live'. I'll get some replace parts and try again. (sigh)
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Old 11-02-2010, 11:54 AM
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You guys are gonna learn the hard way! Please, take Jeff's advice and pull the negative battery cable before working on electronics!
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Old 11-02-2010, 11:59 AM
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I've learned that procrastinating cures all problems.
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Old 11-02-2010, 12:09 PM
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Quote:
Originally Posted by Jacket View Post
I've learned that procrastinating cures all problems.
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Old 11-02-2010, 01:07 PM
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why not pull the positive?
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Old 11-02-2010, 01:53 PM
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Quote:
Originally Posted by subzali View Post
why not pull the positive?
What do you normally use to loosen a battery terminal?

What is that tool made of?

What can happen if it slips and touches anything conductive?

Hint:

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Old 11-02-2010, 03:51 PM
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Quote:
Originally Posted by Rzeppa View Post
What do you normally use to loosen a battery terminal?

What is that tool made of?

What can happen if it slips and touches anything conductive?

Hint:

True dat but one thing to keep in mind (probably not an issue on a 40): Many of the newer rigs have capacitors built into various electronics. Keeping the positive cable on will allow those capacitors to charge and touching a circuit to ground will still let them discharge even with the battery disconnected.
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