Hi,

I recently swapped the alternator in my '90 Hilux Surf (diesel, 2LT 2.4). Trying to mod it to use the voltage regulator from my original alt on a second alternator, I blew both 80A fuses (engine heater/alternator) * ...

Once it all worked again ... almost ... the temperature gauge is reading at zero. I figured this was the sender, and swapped it, but this didn't change the readout on the dash gauge.

I've checked all the other fuses too, they seem fine.

• What voltages should I see going into the sender?
• How can I debug the gauge to isolate and repair the problem?

Any suggestions welcome and much appreciated!

Cheers
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* I blew them both because I swapped them around so I could continue testing