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Trouble shooting 1973 240z Ammeter/Fuel gauge

November 1, 20213 yr

comment_630815

Cool. Things are better when the numbers line up.

So it sounds like the needle heater can deal with 240mA on a pulse width modulated basis, but not forever. It's all about heat and average power.

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https://www.classiczcars.com/forums/topic/65946-trouble-shooting-1973-240z-ammeterfuel-gauge/

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Replies 12
Views 4.4k
Created 3 yr3 yr
Last Reply 3 yr3 yr

Top Posters In This Topic

SteveJ 5 posts
Captain Obvious 5 posts
cgsheen1 1 post
Hayden 1 post

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SteveJ

October 31, 20213 yr

So I set up the gauge with my power supply and a variable resistor. It's interesting to me to watch the power supply ammeter while I'm doing the demonstration.
Captain Obvious

November 1, 20213 yr

Well that's what I get for relying on memory... I just took a quick look at a fuel gauge, and I got the heater resistances wrong. The heaters (both regulator and needle movement) resistances are about
SteveJ

November 1, 20213 yr

That lines up pretty well with what I was reading on the power supply.

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