Swisher ZT2454 Won't Start / Blows Fuse

[chris.wyse]

That makes sense. I'll try it this weekend. I was confused when I read 8V instead of 12 V when I connected the ground to the engine. Still don't understand why it wouldn't be 12 V, but I'll try the switches.

Thanks.

 

[chris.wyse]

That makes sense. I'll try it this weekend. I was confused when I read 8V instead of 12 V when I connected the ground to the engine. Still don't understand why it wouldn't be 12 V, but I'll try the switches.

Thanks.

I undid the jumper on one of the lap switches and plugged it in. I plugged in ignition switch and switched it to on. Fuse blew. Did the same on the other lap bar switch. Same result.

Ugh.

 

[chris.wyse]

Did some more testing. I have two batteries connected by jumper cables. In #5 and #6, I tested from the negative terminal of the good battery which is connected to the installed battery. I'm thinking that the nominally high resistance from the solenoid ground might be due to the jumper cable connection??? On the engine ground, I couldn't even get a reading with my ohm meter.

How would I address this? I think I had a solid connection to the engine ground for testing. Should I run an additional wire from the battery negative to the engine ground lead? Is there anything else I need to consider?

Step	Action	Configuration/Connections	Expected Result	Observations
1	Unplug ignition switch, jumper B to L terminals on plug	B to L terminals on ignition switch plug	12V	12V, fuse OK
2	Connect hour meter using solenoid ground (versus engine ground)	L terminal to hour meter positive, hour meter ground to solenoid ground	12V, hour meter working	12V, hour meter working, fuse OK
3	Change hour meter ground to engine ground (normal configuration)	L terminal to hour meter positive, hour meter ground to engine ground	12V, hour meter working	8V, hour meter not working, fuse OK
4	Move hour meter ground back to solenoid ground	L terminal to hour meter positive, hour meter ground to solenoid ground	12V, hour meter working	12V, hour meter working, fuse OK
5	Measure resistance between solenoid ground and battery negative	Multimeter probes on solenoid ground and battery negative	Low resistance (~0 ohms)	14 ohms (somewhat high???)
6	Measure resistance between engine ground and battery negative	Multimeter probes on engine ground and battery negative	Low resistance (~0 ohms)	High resistance

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[chris.wyse]

I believe that the green wire from the hour meter runs to the oil pressure switch. When connected the voltage at the hour meter reads 8V. However when I connect to the ground on the starter solenoid, it reads 12V. Therefore, I assume that the pressure switch or its connection to ground is the issue.

Tomorrow I’ll test the pressure switch.

Does anyone concur with mu analysis??