After repinning burnt GI connectors on the interconnect board, part of the GI came back but one string ran at full brightness (about 6 V) and another was dim (about 3 V).

One playfield GI string dim after connector work: GI relay connection in the backbox

Cause: A poor connection at one of the GI relays (here the one inside the backbox), not the newly repinned connectors.

Checks

• Find the GI relays (on the backbox door and under the playfield) and check their wiring and contacts.
• Measure the GI voltage before and after each relay.

Fix

• Repair the bad connection at the GI relay.

Games

• Jokerz!

Related tips

• Interconnect board from another game fitted: the values Jokerz needs

Source: Pinball Repair help group!! (Facebook group)