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Fuse locations for powering various auxiliary gauges on 240 200

posted by Daryl on Sat Jul 31 09:15 CST 2004
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last visit: Thu Oct 31 14:18 CST 2013

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Which power source/fuse location(s) should be used when installing each of the following auxiliary gauges?

oil pressure

oil temperature

volts

small tachometer

ambient temperature gauge

I plan to use fuse 13 for the volt gauge. Can fuse 13 simultaneously handle all of these other gauges too, or should other fuse locations be used for specific gauges to better distribute the load? All 5 auxiliary gauge lights will need a fuse location too. Fuse 13 for these as well, or is another location adviseable? Thanks for sharing your experiences.

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Fuse locations for powering various auxiliary gauges on 240 200

posted by rhaire on Sat Jul 31 10:07 CST 2004
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last visit: Mon Aug 4 10:16 CST 2014

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Use any available ignition-off fuse terminal. It gets crowded. You will need some of those one terminal female to to two terminal male adaptors. Power consumption by the gauges is not an issue.

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Fuse locations for powering various auxiliary gauges on 240 200

posted by Don Foster on Sat Jul 31 09:28 CST 2004
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last visit: Sun Oct 5 11:53 CST 2014

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For the earlier 240s (e.g., '82, '83, '84, '85), fuse 13 is a good choice.

The fuses are clustered into three types:
- Always powered
- Powered with the key in "run" position
- Powered with the key in "acc" position.

None of those instruments draws appreciable current. Select any available fuses in the third catagory -- powered when the key is in the "acc" position.

You can determine the catagory of each fuse using a test light.

Note: Avoid the fuse that supplies any heavy current accessory (such as the blower motor) when connecting the voltmeter. Otherwise, you may get an inaccurately low reading when the accessory is drawing current. (The directionals are another power hungry accessory...)

It never hurts to clean and tighten or re-tension (= bend) the fuse clips to improve their contact with the fuses.

--
Don Foster (near Cape Cod, MA)

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Fuse locations for powering various auxiliary gauges on 240 200

posted by Daryl on Sat Jul 31 10:13 CST 2004
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last visit: Thu Oct 31 14:18 CST 2013

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Thanks Don for your advice. How about the later 240s (after 85), does the same recommendation apply to them? Is it OK to supply the aux gauge lights from the same fuse?

What is the reason for not using those fuses which only supply power in the ON switch position?

Do you see any problem in making up a common wiring harness with a gang connector for this auxiliary gauge cluster?

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Fuse locations for powering various auxiliary gauges on 240 200

posted by Don Foster on Sat Jul 31 12:13 CST 2004
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last visit: Sun Oct 5 11:53 CST 2014

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"How about the later 240s (after 85), does the same recommendation apply to them?"

In the general sense, yes. But I'm not sure if fuse 13 is the right choice for the later cars (and I SHOULD know 'cause I wired my '86 and '90, but I don't remember....).

"What is the reason for not using those fuses which only supply power in the ON switch position?"

Probably not a good idea to power the instruments when the key's off.

"Do you see any problem in making up a common wiring harness with a gang connector for this auxiliary gauge cluster?"

Nope. Good idea, in fact. You can also tie all the grounds together and all the lights together. Ground everything as I described in another post to you and tie the lights to the power wire going to the panel lights in the center console.

As Bob Haire said, most of the instruments have a power lead that includes a male-female thingy connector at the end, so you can "daisy chain" them.

--
Don Foster (near Cape Cod, MA)

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One common ground for all gauges too? 200

posted by Daryl on Sat Jul 31 09:18 CST 2004
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last visit: Thu Oct 31 14:18 CST 2013

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I neglected to ask if it is advisable to use a single ground location for all these auxiliary gauges and their lights? If so, what is recommended?

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One common ground for all gauges too? 200

posted by Don Foster on Sat Jul 31 09:30 CST 2004
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last visit: Sun Oct 5 11:53 CST 2014

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Very often the auxilliary instruments (and their lights) are grounded to the screw that's in the dash frame just under and to the right of the ignition switch.

--
Don Foster (near Cape Cod, MA)

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