gcbennet
Member
- 221
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- 18
- Location
- Trenton, ON
My ‘85 M998 w/6.2 has been experiencing a parasitic draw. Inconvenient but not terribly detrimental yet. The troubleshooting to narrow down the culprit is as follows:
-disconnect neg battery terminal of aft battery.
-Set multimeter to the 10A setting, making sure the leads are in the appropriate positions.
-place one lead on the neg battery terminal and the other on the disconnected neg cable eyelet.
-reading should be zero or thereabouts. If it’s not, you have a parasitic drain.
-one at a time, disconnect things and take a reading. The alternator and starter are the typical culprits apparently.
In my case the starter was the culprit. Troubleshooting further I disconnected cables and wires one at a time to narrow it down. Turns out when I disconnect cable 81A (pictured) the drain stops. Unfortunately I traced this cable all the way forward to the main cannon plug going to the S3 box so there’s not much I can do at this point.
![D542AF04-EB68-4D49-AC88-71CDE4DC109C.jpeg D542AF04-EB68-4D49-AC88-71CDE4DC109C.jpeg](https://www.steelsoldiers.com/data/attachments/662/662119-1752a3b9e77728c10fb5fc9573951264.jpg)
![227CBFAA-C4A6-447C-B46F-8D57D6AF0396.jpeg 227CBFAA-C4A6-447C-B46F-8D57D6AF0396.jpeg](https://www.steelsoldiers.com/data/attachments/662/662120-69a3d2929d20d6371ee0bf45e131e7b2.jpg)
-disconnect neg battery terminal of aft battery.
-Set multimeter to the 10A setting, making sure the leads are in the appropriate positions.
-place one lead on the neg battery terminal and the other on the disconnected neg cable eyelet.
-reading should be zero or thereabouts. If it’s not, you have a parasitic drain.
-one at a time, disconnect things and take a reading. The alternator and starter are the typical culprits apparently.
In my case the starter was the culprit. Troubleshooting further I disconnected cables and wires one at a time to narrow it down. Turns out when I disconnect cable 81A (pictured) the drain stops. Unfortunately I traced this cable all the way forward to the main cannon plug going to the S3 box so there’s not much I can do at this point.
![D542AF04-EB68-4D49-AC88-71CDE4DC109C.jpeg D542AF04-EB68-4D49-AC88-71CDE4DC109C.jpeg](https://www.steelsoldiers.com/data/attachments/662/662119-1752a3b9e77728c10fb5fc9573951264.jpg)
![227CBFAA-C4A6-447C-B46F-8D57D6AF0396.jpeg 227CBFAA-C4A6-447C-B46F-8D57D6AF0396.jpeg](https://www.steelsoldiers.com/data/attachments/662/662120-69a3d2929d20d6371ee0bf45e131e7b2.jpg)