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GPS Shuts off when starting gas motor UPDATE WITH SPECS
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<blockquote data-quote="DaleH" data-source="post: 464488" data-attributes="member: 15636"><p>Check to make sure all connections are clean. And was it ever working OK? </p><p></p><p>Starters pull a lot of peak amps, like a V6 is ~250 amps peak or so then dropping to 175 continuous whilst cranking. </p><p></p><p>I just did the ampacity calculations for a 4AWG 12’ run (that means a 24’ circuit for ampacity) and I thought the total capacity (amps) for 4AWG was 160 or so. And that was for a load 12’ away from the battery. </p><p></p><p>You might be pulling a lot of resistance, as even the you have long OB leads too. If your leads are close to 15’ long, 30’ circuit, the ampacity of that 4AWG cable is only rated for 100-amps ... see ampacity table attached, so that could be why you’re pulling down the GPS.</p><p></p><p>At that length run, even a 10% voltage drop of a typical 12.6 VDC circuit is going to be 11.34 volts and some sensitive electrical devices drop out at around 11 volts. I’d check your cable sizes w/ your OB and the H’bird recommendations, sounds like you’re trying to pull too many amps on too far a run.</p></blockquote><p></p>
[QUOTE="DaleH, post: 464488, member: 15636"] Check to make sure all connections are clean. And was it ever working OK? Starters pull a lot of peak amps, like a V6 is ~250 amps peak or so then dropping to 175 continuous whilst cranking. I just did the ampacity calculations for a 4AWG 12’ run (that means a 24’ circuit for ampacity) and I thought the total capacity (amps) for 4AWG was 160 or so. And that was for a load 12’ away from the battery. You might be pulling a lot of resistance, as even the you have long OB leads too. If your leads are close to 15’ long, 30’ circuit, the ampacity of that 4AWG cable is only rated for 100-amps ... see ampacity table attached, so that could be why you’re pulling down the GPS. At that length run, even a 10% voltage drop of a typical 12.6 VDC circuit is going to be 11.34 volts and some sensitive electrical devices drop out at around 11 volts. I’d check your cable sizes w/ your OB and the H’bird recommendations, sounds like you’re trying to pull too many amps on too far a run. [/QUOTE]
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GPS Shuts off when starting gas motor UPDATE WITH SPECS
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