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alternator
Aug 27, 2015 20:24:01 GMT -5
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Post by dawg67 on Aug 27, 2015 20:24:01 GMT -5
I am a very recent mazda perkins owner. I like my little truck but suffer from a couple of problems from previous repairs which I think I have fixed. After putting it back together and starting it right up, the wire from the fusible link connection to the battery, got quite warm even though the battery was fully charged b4 I started it. Voltage readings show .5 to .6 volts higher at the alternator than the battery. I suspect that's not right. Any ideas anyone?
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Post by gradyc on Aug 27, 2015 23:42:35 GMT -5
The fusible link is basically an inline resistor that is designed to burn in two before the rest of the wire can catch fire. It will drop the voltage slightly and get warm when carrying a current so everything sounds about normal. Diesel engines take quite a bit of current to start added to the power used by the glow plug system which is also fairly large and after the engine starts the alternator works quite hard for a few minutes to replace this used battery power.
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alternator
Aug 28, 2015 20:19:14 GMT -5
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Post by dawg67 on Aug 28, 2015 20:19:14 GMT -5
Done some more testing and found the spade connectors 4 the fusible links the biggest source of my problems. Before starting it, I checked the glow plug voltage before the light went out. It shows about 9.5 volts until the light goes out and then it drops to about 4.5 volts for IDK how long. Unplugging the glow plug pwr supply made battery voltage jump from about 12.2 to 13.5 volts. I am thinking there is a huge voltage loss between the pwr source and the GP themselves. Any idea what the voltage should b upon initial cranking and what it drops to? All help is greatly appreciated.
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Post by gradyc on Aug 29, 2015 1:50:14 GMT -5
Your glow plug situation is also normal. The timer feeds full voltage to the glow plugs for I think about 6 seconds and then switches the feed through the intake heater to the glow plugs, to drop the voltage to the glow plugs. In reality the plugs are designed for 6 volts and are fed full battery voltage for a short time for fast heat-up. If they were to continue getting the full voltage they would burn out very quickly. They draw a large current to get hot so the battery voltage drop sounds about right too.
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Post by dawg67 on Aug 29, 2015 8:48:13 GMT -5
Gradyc, I really appreciate the info. I bought this thing 4 some reliable, economical transportation I hope this works out. I need 2 get my hands on the FSM. Many thanx again
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