"Have had this problem 3 times
"Have had this problem 3 times. Config: F150 with 2 batteries and Quest battery switch set to battery 1. Only accessory on was the Lowrance chartplotter.
Normal cold engine start, operate for an hour or so shutting down to fish then start to move a few times. The last time the engine wouldn’t start. With key to start position the starter wouldn’t engage, a barely audible click, engine instruments digits fade to off. With ignition “on” (not start) engine wouldn’t tilt, engine instrument reads 7.4 VDC but starting battery read 12.2 VDC measured at the battery terminals with a DVM. Also read 12.2 VDC at the starter solenoid. Whith ignition “on” checked other accessories: horn is loud, bait and live well and bilge pumps are loud (normal). Identical symptoms when switch to battery 2. Also removed battery terminals and connected to trolling motor battery with jumper cables - same results.
- First time this happened I pulled the 20 amp fuse for the starter, was ok, put it back in and engine operated normally, for a few hours.
- Second time I removed all the battery cables and 6 or so ground wires from common post.and cleaned each and charged both batteries. Ok for only a couple of hours.
- Third time removed cables again, checked fuses etc.with no change. Hooked up battery charger and monitored the engine instrument voltage. After a couple of minutes it changed from 7.4 VDC to 13.6 and the engine now operates normally.
Reluctant to take it out again. At $95/hr labor cost I am also reluctant to take it into the dealer with things working normally.
Have poured over the factory service manual. Can anyone explain why the engine instrument can read 7.4 vdc and votage at the battery terminals is 12.2 vdc? What needs fixin?"
"Have had this problem 3 times. Config: F150 with 2 batteries and Quest battery switch set to battery 1. Only accessory on was the Lowrance chartplotter.
Normal cold engine start, operate for an hour or so shutting down to fish then start to move a few times. The last time the engine wouldn’t start. With key to start position the starter wouldn’t engage, a barely audible click, engine instruments digits fade to off. With ignition “on” (not start) engine wouldn’t tilt, engine instrument reads 7.4 VDC but starting battery read 12.2 VDC measured at the battery terminals with a DVM. Also read 12.2 VDC at the starter solenoid. Whith ignition “on” checked other accessories: horn is loud, bait and live well and bilge pumps are loud (normal). Identical symptoms when switch to battery 2. Also removed battery terminals and connected to trolling motor battery with jumper cables - same results.
- First time this happened I pulled the 20 amp fuse for the starter, was ok, put it back in and engine operated normally, for a few hours.
- Second time I removed all the battery cables and 6 or so ground wires from common post.and cleaned each and charged both batteries. Ok for only a couple of hours.
- Third time removed cables again, checked fuses etc.with no change. Hooked up battery charger and monitored the engine instrument voltage. After a couple of minutes it changed from 7.4 VDC to 13.6 and the engine now operates normally.
Reluctant to take it out again. At $95/hr labor cost I am also reluctant to take it into the dealer with things working normally.
Have poured over the factory service manual. Can anyone explain why the engine instrument can read 7.4 vdc and votage at the battery terminals is 12.2 vdc? What needs fixin?"
