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Not done testing yet Posted by Ari [Email] ![]() ![]() In Reply to: Followup with my 93 9000CS no start.., Jesse Chamberlain, Tue, 22 Feb 2005 09:43:19 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Yes, 12 volts on one pin is good. But without a ground, no current will flow. You MUST make sure that there is a good ground on the ground pin.
The next part is trickier. When you measured the voltage at the pump, did you do it with it connected to the pump? If you did, that's good. If you didn't, try that. With the meter on volts, measure between the 12 volt and ground pins, connected to the pump. If you see 12 volts (or so) there, then you know the problem lies in the pump. If you don't see 12 volts there, the problem can be elsewhere. First, with the connector on the pump, measure the 12 volt pin to chassis ground. It should be 12 volts. Now, measure the ground pin to chassis ground. It should be under 0.1 volts. If it isn't, like 2 or 3 or 12 volts, then you've got a bad ground.
It takes two things to make the pump run - volts and current. If you have a high resistance in the circuit, and you measure the voltage without the pump connected, there is effectively no current flow. There is no voltage drop across the resistance, so you'll see 12 volts. But the second you connect the pump and there is a current flow, the voltage drop across the resistance drops the voltage. The pump doesn't run.
So, do the test with the connector on the pump, and make sure you've got a good ground there.
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